UPSC Mains Syllabus: GS 1, 2, 3, 4, Essay and Optional

The UPSC Civil Services (Main) Examination is the second and one of the most important stages of the Civil Services Examination. Unlike the Preliminary Examination, which consists of objective-type questions, the Main Examination is descriptive. It tests a candidate’s understanding of important subjects, ability to analyse issues, clarity of thought and capacity to present well-structured answers.

The UPSC Mains Syllabus 2027 covers a wide range of subjects, including Indian history and culture, geography, polity, governance, international relations, economy, science and technology, environment, internal security and ethics. In addition to four General Studies papers, candidates have to write an Essay paper and two papers of one optional subject. There are also two qualifying language papers. This article explains the complete UPSC Mains syllabus paper-wise, along with the marks, examination structure and list of optional subjects for candidates preparing for CSE 2027.

UPSC Mains Syllabus 2027: Overview

The Civil Services Main Examination consists of nine written papers. Two of these papers are qualifying in nature, while the marks obtained in the remaining seven papers are counted for merit. Candidates who qualify in the written examination are called for the Interview or Personality Test.

Each written paper has a duration of three hours. The two language papers carry 300 marks each but are qualifying in nature. Therefore, their marks are not included in the final merit total.

After the written examination, candidates who meet the prescribed requirements are called for the Interview or Personality Test, which carries 275 marks. The final merit list is prepared on the basis of 1,750 marks from the written examination and 275 marks from the Interview, making a total of 2,025 marks.

UPSC Mains Syllabus 2027: Paper-wise Details

The following sections explain the syllabus of all nine written papers. The subject-wise explanations are intended to make the official syllabus easier to understand. They do not replace the detailed syllabus published by UPSC.

Paper A: Indian Language Syllabus

Paper A is a qualifying paper in which candidates have to choose one Indian language from the languages included in the Eighth Schedule of the Constitution of India, subject to the applicable rules and exemptions.

The paper carries 300 marks and is of matriculation or equivalent standard. Candidates are required to secure at least 25% marks, that is, 75 marks out of 300, to qualify in this paper under the current examination rules.

The purpose of this paper is to test a candidate’s ability to read and understand serious prose and express ideas clearly in the chosen Indian language.

The broad areas covered in the Indian Language paper are:

• Comprehension of given passages.
• Precis writing.
• Usage and vocabulary.
• Short essays.
• Translation from English to the chosen Indian language and vice versa.

Languages Available for Paper A

Candidates can choose one of the following languages included in the Eighth Schedule of the Constitution:

• Assamese
• Bengali
• Bodo
• Dogri
• Gujarati
• Hindi
• Kannada
• Kashmiri
• Konkani
• Maithili
• Malayalam
• Manipuri
• Marathi
• Nepali
• Odia
• Punjabi
• Sanskrit
• Santhali
• Sindhi
• Tamil
• Telugu
• Urdu

Exemption: Under the current rules, Paper A is not compulsory for candidates hailing from Arunachal Pradesh, Manipur, Meghalaya, Mizoram, Nagaland and Sikkim. Candidates should check the applicable examination notification for the precise conditions and any other permitted exemption.

Paper B: English Language Syllabus

Paper B is the compulsory English language paper. It carries 300 marks and is also qualifying in nature. Candidates must secure at least 25% marks, or 75 marks out of 300, under the current rules.

The purpose of this paper is to assess a candidate’s ability to understand written English and communicate ideas correctly and clearly. The paper is of matriculation or equivalent standard.

The broad syllabus includes:

• Comprehension of given passages.
• Precis writing.
• Usage and vocabulary.
• Short essays.

The marks obtained in Paper A and Paper B are not counted towards the final merit list. However, qualifying in both papers is necessary for the evaluation of the merit-based papers, subject to the applicable rules.

Paper I: UPSC Mains Essay Syllabus

The Essay paper carries 250 marks and is counted for merit. Candidates may be required to write essays on multiple topics. The official syllabus expects candidates to remain focused on the subject, organise their ideas in a logical manner and express themselves clearly and concisely.

Unlike the General Studies papers, the Essay paper does not have a fixed list of subject-wise topics. Questions may cover a wide range of social, political, economic, philosophical, scientific, environmental and contemporary issues.

For preparation, candidates should develop the ability to write on themes such as:

• Indian society, social change and social justice.
• Democracy, governance and constitutional values.
• Education, health and human development.
• Economic development and inclusive growth.
• Science, technology and innovation.
• Environment, climate change and sustainable development.
• Ethics, morality and human values.
• Women empowerment and gender equality.
• International relations and global challenges.
• Philosophical ideas and their relevance to society.

These are broad preparation themes, not an official list of essay topics prescribed by UPSC. Candidates should practise presenting balanced arguments, supporting their ideas with relevant examples and maintaining a clear flow throughout the essay.

Paper II: General Studies Paper I Syllabus

General Studies Paper I carries 250 marks. Its official subject description is Indian Heritage and Culture, History and Geography of the World and Society.

This paper covers Indian art and culture, modern Indian history, the freedom struggle, post-independence developments, world history, Indian society and geography.

1. Indian Heritage and Culture

This section covers the important features of Indian culture from ancient to modern times. UPSC specifically mentions art forms, literature and architecture.

Important areas for preparation include:

• Indian art and cultural traditions.
• Ancient, medieval and modern Indian architecture.
• Temple, Buddhist and Jain architecture.
• Indian sculpture and painting traditions.
• Classical and folk dances of India.
• Indian music and musical traditions.
• Literature and important literary traditions.
• Religious and philosophical traditions.
• Cultural institutions and heritage conservation.

2. Modern Indian History

The syllabus covers modern Indian history from about the middle of the eighteenth century to the present. Candidates should understand important events, personalities and issues that shaped India’s political, social and economic development.

Important areas include:

• Decline of the Mughal Empire and rise of regional powers.
• Arrival and expansion of European trading companies in India.
• Establishment and expansion of British rule.
• Important battles, policies and administrative developments under British rule.
• Economic impact of British rule in India.
• Social and religious reform movements of the nineteenth century.
• Revolt of 1857 and its consequences.
• Growth of Indian nationalism.
• Formation and development of the Indian National Congress.
• Moderate and Extremist phases of the national movement.
• Swadeshi Movement, Home Rule Movement and revolutionary activities.
• Gandhian movements and other important phases of the freedom struggle.
• Role of important leaders, organisations and personalities.

3. Indian National Movement

The freedom struggle is an important part of General Studies Paper I. UPSC expects candidates to understand its different stages and the contributions of people and organisations from different parts of the country.

Important areas include:

• Early resistance to British rule.
• Formation of political associations and the Indian National Congress.
• Moderate and Extremist approaches.
• Swadeshi and Boycott Movement.
• Revolutionary movements in India and abroad.
• Home Rule Movement.
• Non-Cooperation Movement.
• Civil Disobedience Movement.
• Quit India Movement.
• Peasant, tribal and workers’ movements.
• Role of women in the freedom struggle.
• Contributions of regional leaders and organisations.
• Events and negotiations leading to independence and partition.

4. Post-Independence Consolidation and Reorganisation

This section deals with the major political and administrative developments after independence. Candidates should understand how India addressed the challenges of nation-building and territorial reorganisation.

Important areas include:

• Integration of princely states.
• Political and administrative consolidation after independence.
• Reorganisation of states on linguistic and other grounds.
• Major challenges faced by the newly independent country.
• Developments relating to national unity and territorial integration.
• Important political and socio-economic developments in the post-independence period.

5. World History

The world history portion covers major events from the eighteenth century onwards. Candidates should understand the causes, important developments and consequences of major historical events and political ideas.

Important areas include:

• Industrial Revolution and its effects.
• American and French Revolutions and their wider influence.
• Unification of Italy and Germany.
• Imperialism and colonial expansion.
• World War I and its consequences.
• Russian Revolution and the rise of communism.
• World War II and its consequences.
• Decolonisation in Asia and Africa.
• Redrawing of national boundaries.
• Cold War and major international developments.
• Political philosophies such as capitalism, socialism and communism and their impact on society.

6. Indian Society

This section covers the main features of Indian society and its diversity. It also deals with social issues, development challenges and changes taking place in Indian society.

Important areas include:

• Salient features of Indian society.
• Diversity of India, including linguistic, religious, regional and cultural diversity.
• Unity and diversity in Indian society.
• Role of women and women’s organisations.
• Population and associated issues.
• Poverty and developmental issues.
• Urbanisation, its problems and remedies.
• Effects of globalisation on Indian society.
• Social empowerment.
• Communalism, regionalism and secularism.
• Social inequalities and changing social relationships.

7. World and Indian Geography

The geography section covers the physical features of the world, the distribution of natural resources and the location of industries. It also includes important geographical phenomena and their effects.

Important areas include:

• Salient features of the world’s physical geography.
• Major landforms, mountains, plateaus, plains and river systems.
• Distribution of key natural resources across the world, including South Asia and the Indian subcontinent.
• Factors responsible for the location of primary, secondary and tertiary sector industries.
• Industrial location in India and other parts of the world.
• Earthquakes, tsunamis, volcanic activity and cyclones.
• Changes in important geographical features, including water bodies and ice caps.
• Changes in flora and fauna and their geographical effects.
• Important environmental and geographical changes.

Paper III: General Studies Paper II Syllabus

General Studies Paper II carries 250 marks. Its official subject description is Governance, Constitution, Polity, Social Justice and International Relations.

This paper focuses on the Indian Constitution, political institutions, governance, government policies, social welfare and India’s relations with other countries.

1. Indian Constitution

This section covers the constitutional framework of India, its evolution, important provisions and the principles on which it is based.

Important areas include:

• Historical background and evolution of the Constitution.
• Salient features of the Indian Constitution.
• Preamble and constitutional philosophy.
• Fundamental Rights and Directive Principles of State Policy.
• Fundamental Duties.
• Constitutional amendments.
• Basic structure doctrine.
• Important constitutional provisions and their interpretation.

2. Federalism and Centre-State Relations

This section examines the distribution of powers between the Union and the States and the functioning of India’s federal system.

Important areas include:

• Functions and responsibilities of the Union and State governments.
• Legislative, administrative and financial relations between the Centre and States.
• Issues and challenges relating to federalism.
• Devolution of powers and finances to local levels.
• Role and functioning of local self-government institutions.
• Issues relating to cooperative and competitive federalism.

3. Separation of Powers and Constitutional Institutions

This section deals with the relationship between the Legislature, Executive and Judiciary and the institutions responsible for maintaining constitutional governance.

Important areas include:

• Separation of powers among the organs of government.
• Checks and balances.
• Dispute redressal mechanisms and institutions.
• Comparison of the Indian constitutional system with that of other countries.
• Constitutional bodies and their powers and functions.
• Statutory, regulatory and quasi-judicial bodies.

4. Parliament and State Legislatures

This section covers the structure, functioning and powers of Parliament and State Legislatures.

Important areas include:

• Composition and structure of Parliament.
• Functions and powers of the Lok Sabha and Rajya Sabha.
• Legislative procedure and parliamentary processes.
• Parliamentary committees.
• Privileges of Parliament and its members.
• Structure and functioning of State Legislatures.
• Issues affecting the functioning of legislatures.

5. Executive and Judiciary

The syllabus includes the structure, organisation and functioning of the Executive and Judiciary at different levels of government.

Important areas include:

• President, Vice-President, Prime Minister and Council of Ministers.
• Governor, Chief Minister and State Council of Ministers.
• Central and State ministries and departments.
• Supreme Court and High Courts.
• Judicial review and judicial accountability.
• Important judicial developments and institutional issues.
• Pressure groups and formal and informal associations and their role in the political system.

6. Representation of the People Act

This section covers important provisions of the Representation of the People Acts and issues relating to elections and electoral processes in India.

Preparation should include the legal framework governing elections, qualifications and disqualifications, electoral offences and important electoral reforms.

7. Constitutional and Other Bodies

Candidates should understand the appointment, powers, functions and responsibilities of important constitutional bodies. The syllabus also includes statutory, regulatory and quasi-judicial bodies.

Important areas include:

• Election Commission of India.
• Union Public Service Commission and State Public Service Commissions.
• Finance Commission.
• Comptroller and Auditor General of India.
• National Commissions and other constitutional bodies.
• Important statutory and regulatory institutions.
• Quasi-judicial bodies and their functions.

8. Government Policies and Interventions

This section deals with government policies and programmes for development and the challenges involved in their design and implementation.

Important areas include:

• Government policies in important sectors.
• Policy formulation and implementation.
• Development programmes and public service delivery.
• Challenges in the implementation of government schemes.
• Role of institutions and stakeholders in development.

9. Development Processes and the Role of Stakeholders

The syllabus covers the role of non-governmental organisations, self-help groups, civil society organisations, donors, charities and other institutions in development.

Important areas include:

• Role of NGOs and civil society organisations.
• Self-help groups and community participation.
• Development agencies and institutional stakeholders.
• Public-private partnerships and development initiatives.
• Participation of citizens in development processes.

10. Welfare Schemes and Social Justice

This section focuses on welfare schemes for vulnerable sections of society and the institutions and laws created for their protection and development.

Important areas include:

• Welfare schemes for women and children.
• Programmes for Scheduled Castes, Scheduled Tribes and Other Backward Classes.
• Measures for minorities and other vulnerable groups.
• Welfare initiatives for persons with disabilities.
• Implementation and performance of welfare schemes.
• Institutions and laws for the protection of vulnerable sections.
• Issues relating to poverty and hunger.

11. Health, Education and Human Resources

This section covers the development and management of social sector services, particularly health, education and human resources.

Important areas include:

• Public health systems and healthcare delivery.
• Health infrastructure and access to healthcare.
• Education policies and institutions.
• Quality and accessibility of education.
• Skill development and human resource development.
• Nutrition and other social sector concerns.

12. Governance, Transparency and Accountability

This section deals with the principles and practices of good governance and the mechanisms used to make public administration transparent and accountable.

Important areas include:

• Transparency and accountability in government.
• E-governance applications, models, successes and limitations.
• Citizen Charters.
• Right to Information.
• Institutional mechanisms for accountability.
• Public service delivery and administrative reforms.
• Role of civil services in a democracy.

13. India and Its Neighbourhood

This section covers India’s relations with neighbouring countries and the major issues influencing regional cooperation and security.

Important areas include:

• India’s bilateral relations with neighbouring countries.
• Political, economic and security issues in South Asia.
• Regional cooperation and connectivity.
• Border-related issues and cross-border challenges.
• Regional organisations and initiatives.

14. International Relations

The international relations portion examines India’s relations with major countries, regional groupings and international institutions.

Important areas include:

• Bilateral relations involving India.
• Regional and global groupings and agreements involving India.
• International agreements affecting India’s interests.
• Impact of policies and politics of developed and developing countries on India.
• Indian diaspora and its role in international relations.
• Important international institutions, agencies and forums.
• Structure and mandate of international organisations.

Paper IV: General Studies Paper III Syllabus

General Studies Paper III carries 250 marks. Its official subject description is Technology, Economic Development, Biodiversity, Environment, Security and Disaster Management.

This paper covers the Indian economy, agriculture, science and technology, environmental conservation, internal security and disaster management.

1. Indian Economy and Economic Development

This section deals with the functioning of the Indian economy and issues relating to economic growth, development, employment and resource mobilisation.

Important areas include:

• Planning and economic development in India.
• Mobilisation of resources.
• Economic growth and development.
• Employment and unemployment.
• Inclusive growth and related challenges.
• Government budgeting.
• Economic reforms and their impact.
• Industrial policy and industrial growth.
• Investment models and infrastructure development.

2. Agriculture and Cropping Patterns

Agriculture is an important part of General Studies Paper III. The syllabus covers cropping patterns, irrigation, agricultural marketing, subsidies, food security and the use of technology in agriculture.

Important areas include:

• Major crops and cropping patterns in different parts of India.
• Different types of irrigation and irrigation systems.
• Storage, transport and marketing of agricultural produce.
• Constraints faced by farmers and agricultural markets.
• Use of e-technology in support of farmers.
• Direct and indirect farm subsidies.
• Minimum Support Price (MSP).
• Public Distribution System and its objectives and functioning.
• Buffer stocks and food security.
• Technology missions in agriculture.
• Economics of animal rearing.

3. Food Processing and Related Industries

This section covers the food processing industry in India, its importance, potential and challenges.

Important areas include:

• Scope and significance of food processing.
• Location of food processing industries.
• Upstream and downstream requirements.
• Supply chain management.
• Food storage and processing infrastructure.
• Value addition and employment generation.

4. Land Reforms in India

The syllabus includes land reforms and their role in agricultural and rural development. Candidates should understand the objectives, major measures and challenges associated with land reforms in India.

5. Effects of Liberalisation on the Economy

This section examines the effects of economic liberalisation on the Indian economy, including changes in industrial policy and their impact on industrial growth.

Important areas include:

• Economic reforms introduced since 1991.
• Liberalisation, privatisation and globalisation.
• Changes in industrial policy.
• Impact of economic reforms on industrial growth.
• Challenges relating to investment, employment and competitiveness.

6. Infrastructure

This section covers major infrastructure sectors and their importance for economic development.

Important areas include:

• Energy and power infrastructure.
• Ports and shipping.
• Roads and highways.
• Railways.
• Airports and aviation.
• Infrastructure investment and development models.

7. Science and Technology

The science and technology section focuses on recent developments and their applications in everyday life. It also covers India’s achievements and efforts towards developing indigenous technologies.

Important areas include:

• Developments in science and technology.
• Applications of science and technology in daily life.
• Achievements of Indians in science and technology.
• Indigenisation of technology.
• Information technology and computers.
• Space technology and space research.
• Robotics and artificial intelligence-related developments.
• Nanotechnology and biotechnology.
• Intellectual Property Rights (IPR) issues.

8. Environment and Biodiversity

This section covers environmental conservation, pollution, degradation and environmental impact assessment.

Important areas include:

• Environmental conservation and protection.
• Biodiversity and ecosystem conservation.
• Environmental pollution and degradation.
• Climate change and its effects.
• Environmental Impact Assessment (EIA).
• Conservation policies and programmes.
• Environmental challenges associated with development.

9. Disaster Management

The syllabus includes disasters and disaster management. Candidates should understand different types of disasters, their causes and effects, and the measures required for prevention, preparedness, response and recovery.

Important areas include:

• Natural and human-induced disasters.
• Earthquakes, floods, cyclones, droughts and landslides.
• Disaster preparedness and mitigation.
• Early warning systems.
• Disaster response and recovery.
• Institutional framework for disaster management in India.

10. Internal Security

Internal security is an important component of General Studies Paper III. It covers the causes of internal security challenges, the role of various actors and the measures required to address them.

Important areas include:

• Linkages between development and the spread of extremism.
• Role of external State and non-State actors in creating internal security challenges.
• Challenges to internal security through communication networks.
• Role of media and social networking sites in internal security challenges.
• Basics of cyber security.
• Money laundering and its prevention.
• Security challenges and their management in border areas.
• Linkages between organised crime and terrorism.
• Various security forces and agencies and their mandates.

Paper V: General Studies Paper IV Syllabus

General Studies Paper IV carries 250 marks. Its official subject description is Ethics, Integrity and Aptitude. The paper tests a candidate’s understanding of ethical principles and their ability to apply these principles while dealing with administrative and public service situations.

The paper includes both theoretical questions and case studies. The official syllabus covers the following broad areas:

1. Ethics and Human Interface

• Essence, determinants and consequences of ethics in human actions.
• Dimensions of ethics.
• Ethics in private and public relationships.
• Human values and lessons from the lives and teachings of great leaders, reformers and administrators.
• Role of family, society and educational institutions in developing values.

2. Attitude

• Content, structure and function of attitude.
• Influence of attitude on thought and behaviour.
• Moral and political attitudes.
• Social influence and persuasion.

3. Aptitude and Foundational Values for Civil Services

• Integrity.
• Impartiality and non-partisanship.
• Objectivity.
• Dedication to public service.
• Empathy.
• Tolerance.
• Compassion towards weaker sections.

4. Emotional Intelligence

This section covers the concept of emotional intelligence and its usefulness and application in administration and governance.

5. Contributions of Moral Thinkers and Philosophers

Candidates should study the contributions of important moral thinkers and philosophers from India and around the world, particularly their ideas relating to ethics, values and human conduct.

6. Public Service Values and Ethics in Public Administration

• Public service values and ethical issues in public administration.
• Ethical concerns and dilemmas in government and private institutions.
• Laws, rules, regulations and conscience as sources of ethical guidance.
• Accountability and ethical governance.
• Strengthening ethical and moral values in governance.
• Ethical issues in international relations and funding.
• Corporate governance.

7. Probity in Governance

• Concept of public service.
• Philosophical basis of governance and probity.
• Information sharing and transparency in government.
• Right to Information.
• Codes of Ethics and Codes of Conduct.
• Citizen Charters and work culture.
• Quality of service delivery.
• Utilisation of public funds.
• Challenges of corruption.

8. Case Studies

The Ethics paper includes case studies based on the topics mentioned in the syllabus. These questions test a candidate’s ability to identify ethical issues, consider different stakeholders, evaluate possible actions and arrive at a reasoned decision.

Paper VI and Paper VII: UPSC Optional Subject Syllabus

In the Main Examination, candidates have to choose one optional subject from the list prescribed by UPSC. The selected subject has two papers, each carrying 250 marks. Together, the optional subject papers contribute 500 marks to the written merit total.

The optional subject syllabus is generally at the honours degree level, which is higher than the bachelor’s degree level but lower than the master’s degree level. For Engineering, Medical Science and Law, the prescribed level corresponds to the bachelor’s degree.

List of UPSC Mains Optional Subjects 2027

As per the latest published examination scheme, candidates can choose one of the following optional subjects:

1. Agriculture
2. Animal Husbandry and Veterinary Science
3. Anthropology
4. Botany
5. Chemistry
6. Civil Engineering
7. Commerce and Accountancy
8. Economics
9. Electrical Engineering
10. Geography
11. Geology
12. History
13. Law
14. Management
15. Mathematics
16. Mechanical Engineering
17. Medical Science
18. Philosophy
19. Physics
20. Political Science and International Relations
21. Psychology
22. Public Administration
23. Sociology
24. Statistics
25. Zoology
26. Literature of any one of the prescribed languages

Languages Available for Literature Optional

Candidates may choose the literature of any one of the following languages as their optional subject:

• Assamese
• Bengali
• Bodo
• Dogri
• Gujarati
• Hindi
• Kannada
• Kashmiri
• Konkani
• Maithili
• Malayalam
• Manipuri
• Marathi
• Nepali
• Odia
• Punjabi
• Sanskrit
• Santhali
• Sindhi
• Tamil
• Telugu
• Urdu
• English

The detailed syllabus of each optional subject is different. Candidates should consult the relevant subject-wise syllabus in the official UPSC examination notification before selecting an optional subject.

UPSC Mains Exam Medium and Language Rules

Candidates can write the merit-based Main Examination papers in English or in one of the languages included in the Eighth Schedule of the Constitution, subject to the rules prescribed by UPSC.

The qualifying Indian Language paper must be answered in the language selected for that paper, while the English paper must be answered in English, except where translation is involved. Candidates should carefully select their examination medium while completing the prescribed application formalities.

The language rules also contain provisions relating to scripts and the use of English technical terms in brackets when candidates write in an Indian language. Candidates should refer to the official notification for the detailed instructions applicable to their chosen medium.

UPSC Mains Examination Duration and Question Paper Type

All nine written papers of the Main Examination are conventional or descriptive in nature. Each paper has a duration of three hours.

The nature and standard of the General Studies papers are intended to test a candidate’s general understanding and analytical ability rather than specialised academic knowledge. Candidates are expected to provide relevant, meaningful and concise answers.

UPSC Mains Qualifying Marks

The two language papers are qualifying in nature. Under the latest published examination rules, candidates must secure at least 25% marks in each paper.

The marks obtained in these papers are not added to the merit total. However, candidates must qualify in both language papers for their merit-based papers to be considered under the applicable rules.

UPSC also has the discretion to prescribe qualifying marks in any or all of the other written papers. Candidates should therefore not assume that a particular score in a General Studies or optional paper automatically guarantees qualification.

UPSC Mains Final Merit: How Are Marks Calculated?

The final ranking in the Civil Services Examination is based on the marks obtained in seven merit-based written papers and the Interview or Personality Test.

The two qualifying language papers, each carrying 300 marks, are excluded from the final merit calculation. Marks obtained in the Preliminary Examination are also not included in the final ranking.

How to Prepare for UPSC Mains 2027 According to the Syllabus

The Main Examination requires a different approach from the Preliminary Examination. Knowing facts and concepts is important, but candidates must also learn to analyse issues and present their understanding in a clear and organised manner.

The following approach can help candidates plan their preparation:

1. Understand the official syllabus: Read each paper’s syllabus carefully. Break broad headings into smaller topics and use the syllabus as a checklist while studying.
2. Build a strong foundation: Use NCERT textbooks and reliable standard books to develop a clear understanding of history, geography, polity, economy, society and other subjects.
3. Prepare General Studies paper-wise: Keep separate notes for GS I, GS II, GS III and GS IV. This makes revision easier and helps avoid unnecessary repetition.
4. Connect current affairs with static subjects: Relate important news and developments to the relevant syllabus topics. For example, a constitutional development can be studied with the relevant provision of the Constitution.
5. Practise answer writing: Regularly write answers within the prescribed word limit and time. Focus on addressing the exact demand of the question.
6. Prepare the optional subject early: The optional subject accounts for 500 marks. Read its complete syllabus and previous years’ question papers before finalising your study plan.
7. Practise Essay writing: Develop the ability to write balanced essays with a clear introduction, logical arguments, relevant examples and a meaningful conclusion.
8. Do not ignore the language papers: Although they are qualifying, failing to secure the minimum marks in either paper can affect the evaluation of the merit-based papers.
9. Revise regularly: The Mains syllabus is extensive. Short, organised notes and repeated revision can help improve retention and answer quality.
10. Use previous years’ question papers: Analyse the questions asked by UPSC to understand the scope of each syllabus topic and the type of analysis expected.

UPSC Mains Syllabus 2027: Official PDF

The official syllabus of the Civil Services Main Examination is published as part of the UPSC Civil Services Examination notification. It contains the examination scheme, marks distribution, qualifying language papers, General Studies syllabus and detailed optional subject syllabi.

The CSE 2027 notification and its detailed rules should be treated as the final authority for that examination. Until the 2027 notification is published, candidates can use the latest available official syllabus as the basis for preparation.

Download UPSC Civil Services Examination 2026 Official Notification and Syllabus (PDF)

Check the UPSC Official Examination Calendar

Frequently Asked Questions (FAQs) on UPSC Mains Syllabus 2027

1. How many papers are there in UPSC Mains?

There are nine written papers in the UPSC Civil Services Main Examination. These include two qualifying language papers, one Essay paper, four General Studies papers and two papers of one optional subject.

2. How many marks are there in UPSC Mains?

The nine written papers together carry 2,250 marks. However, only seven papers carrying 1,750 marks are counted for merit. The two qualifying language papers are excluded from the merit calculation.

3. What is the syllabus of UPSC Mains GS Paper 1?

GS Paper I covers Indian Heritage and Culture, Modern Indian History, the Indian National Movement, post-independence consolidation, world history, Indian society and world and Indian geography.

4. What is the syllabus of UPSC Mains GS Paper 2?

GS Paper II covers Governance, Constitution, Polity, Social Justice and International Relations. Important topics include the Constitution, Parliament, Judiciary, federalism, government policies, welfare schemes, governance and India’s relations with other countries.

5. What is the syllabus of UPSC Mains GS Paper 3?

GS Paper III covers Technology, Economic Development, Biodiversity, Environment, Security and Disaster Management. It includes the Indian economy, agriculture, infrastructure, science and technology, environmental conservation, internal security and disaster management.

6. What is the syllabus of UPSC Mains GS Paper 4?

GS Paper IV covers Ethics, Integrity and Aptitude. Its broad areas include ethics and human values, attitude, aptitude, emotional intelligence, moral thinkers, public service values, probity in governance and case studies.

7. How many optional subjects are available in UPSC Mains?

UPSC provides 26 optional subject choices, including literature of one of the prescribed languages. Candidates must select one optional subject and appear in its two papers.

8. How many marks does the UPSC optional subject carry?

The optional subject consists of two papers, each carrying 250 marks. Therefore, the optional subject contributes a total of 500 marks to the written merit total.

9. What are the qualifying marks for UPSC Mains language papers?

Under the latest published rules, candidates must secure at least 25% marks in each language paper. This means a minimum of 75 marks out of 300 in the Indian Language paper and 75 marks out of 300 in English.

10. Is the UPSC Mains examination objective or descriptive?

The UPSC Main Examination is descriptive in nature. Candidates are required to write conventional answers in all nine papers. Each paper has a duration of three hours.

11. What is the total marks of UPSC Mains and Interview?

The seven merit-based written papers carry 1,750 marks, while the Interview or Personality Test carries 275 marks. The total marks considered for the final merit list are 2,025.

12. Are UPSC Mains language paper marks counted in the final merit list?

No. The Indian Language and English papers are qualifying in nature. Their marks are not added to the final merit total, but candidates must meet the prescribed qualifying standards.

13. Can a candidate choose an optional subject that was not studied during graduation?

Yes. A candidate can choose any optional subject from the list prescribed by UPSC, even if it was not studied at the graduation level, subject to the applicable examination rules.

14. Has the UPSC Mains syllabus for CSE 2027 been officially announced?

The final syllabus and rules applicable to CSE 2027 will be given in the official examination notification for that year. Until it is published, candidates can refer to the latest available official CSE syllabus for preparation. Any changes in the 2027 notification will take precedence.

Official Sources

The examination scheme, marks distribution and subject-wise syllabus explained in this article are based on official UPSC and Government of India documents.

1. UPSC Civil Services Examination 2026 – Official Notification and Detailed Syllabus (PDF)
2. UPSC Examination Division – Examination Scheme and Frequently Asked Questions
3. UPSC – Official Examination Calendar
4. UPSC – Active Examinations and Official Examination Updates

Note for CSE 2027 candidates: This article follows the latest published UPSC Civil Services Examination syllabus available for reference. The detailed CSE 2027 notification and rules, once released, will be the final authority on the syllabus, examination scheme and qualifying requirements. Candidates should check the official UPSC website for any changes before the examination.