UPSC CSE Syllabus 2027

The UPSC Civil Services Examination syllabus is only a small part of the examination notification, but understanding it properly can make a major difference to your preparation. Many aspirants spend months studying books and current affairs without first understanding exactly what the UPSC expects them to cover.

This guide explains the UPSC CSE 2027 syllabus, including the Preliminary Examination, Mains Examination, qualifying papers, optional subjects, marking scheme, examination stages and important dates.

Important: The UPSC Civil Services Examination 2027 notification has not yet been released. Therefore, the detailed syllabus below is based on the latest official CSE syllabus available in the UPSC Civil Services Examination 2026 Examination Notice and CSE Rules 2026. The CSE 2027 Examination Notice is scheduled for 13 January 2027, according to the UPSC Annual Calendar 2027. The 2027 notification will be the final authority if UPSC makes any changes.

For preparation purposes, aspirants can use the latest published syllabus as the working syllabus for CSE 2027, while checking the official notification once it is released.

UPSC CSE 2027 Examination at a Glance

The Civil Services Examination has three broad stages:

1. Civil Services Preliminary Examination
2. Civil Services Main Examination
3. Personality Test/Interview

The Preliminary Examination is a screening stage. Marks obtained in Prelims are not counted towards the final merit list.

The Mains Examination consists of nine written papers, of which seven contribute to merit. Two language papers are qualifying in nature. The final ranking is based on the marks obtained in the seven merit papers of Mains and the Personality Test.

The nine Mains papers have a combined maximum of 2,250 marks. Of these, Papers A and B are qualifying papers worth 300 marks each and do not contribute to the merit total. The remaining seven papers account for 1,750 marks.

UPSC CSE 2027 Preliminary Examination Syllabus

The Preliminary Examination consists of two compulsory objective-type papers:

• General Studies Paper I — 200 marks
• General Studies Paper II (CSAT) — 200 marks

Each paper is of two hours' duration.

Both papers are compulsory. A candidate who does not appear in both papers is disqualified from the Preliminary Examination.

Prelims Paper I: General Studies

Maximum Marks: 200

The General Studies Paper I syllabus covers seven broad areas.

1. Current Events

Current events of national and international importance.

This includes important developments in:

• Indian politics and governance
• Economy
• International relations
• Environment
• Science and technology
• Social issues
• Government policies and programmes
• Major national and international events

Current affairs should not be studied as a separate collection of news. They should be connected to the static subjects mentioned in the UPSC syllabus.

2. History of India and Indian National Movement

This area covers:

• Ancient Indian history
• Medieval Indian history
• Modern Indian history
• British expansion in India
• Colonial policies
• Socio-religious reform movements
• The Indian freedom struggle
• Important personalities and movements
• Events from the nineteenth century onwards

Special importance is given to the Indian National Movement, including its various stages and the contributions of different regions and groups.

3. Indian and World Geography

The syllabus includes:

• Physical geography
• Social geography
• Economic geography
• Geography of India
• Geography of the world

Important areas include physical features, climate, resources, agriculture, industries, population, settlements and geographical processes.

4. Indian Polity and Governance

This section covers:

• Constitution of India
• Political system
• Panchayati Raj
• Public policy
• Rights issues
• Governance
• Constitutional and statutory institutions
• Government structures and processes

Questions can test both conceptual understanding and the application of constitutional and governance principles to contemporary issues.

5. Economic and Social Development

Important areas include:

• Sustainable development
• Poverty
• Inclusion
• Demographics
• Social-sector initiatives
• Economic development
• Employment
• Inclusive growth
• Major government programmes and policies

The emphasis is not simply on economic terminology but on understanding how economic policies affect society and development.

6. Environment, Ecology and Biodiversity

The syllabus includes general issues relating to:

• Environmental ecology
• Biodiversity
• Climate change
• Environmental conservation

The syllabus does not require specialized scientific study of ecology. Questions generally test general awareness and understanding of environmental issues.

7. General Science

This covers basic awareness of:

• Physics
• Chemistry
• Biology
• Everyday science
• Scientific developments
• Science and technology-related issues

The focus is on general understanding rather than specialized academic science.

UPSC CSE Prelims Paper II: CSAT Syllabus

Maximum Marks: 200

Nature: Qualifying

The Civil Services Aptitude Test, commonly known as CSAT, is the second paper of the Preliminary Examination.

The syllabus includes:

• Comprehension
• Interpersonal skills, including communication skills
• Logical reasoning
• Analytical ability
• Decision-making
• Problem-solving
• General mental ability
• Basic numeracy
• Data interpretation

The numeracy and data interpretation components are broadly at Class X level.

CSAT Qualifying Marks

CSAT is qualifying in nature. Candidates must secure at least 33%, or 66 marks out of 200, to qualify.

However, qualifying CSAT should not be interpreted as optional. Candidates must appear in both Prelims papers, and failing to meet the CSAT qualifying standard means failure to qualify for the next stage.

UPSC CSE Prelims Negative Marking

The Preliminary Examination uses negative marking.

For every incorrect answer, one-third of the marks assigned to that question is deducted.

For example, if a question carries two marks, an incorrect answer results in a deduction of approximately 0.67 marks.

Important rules include:

• Correct answer: marks awarded
• Wrong answer: one-third of the question's marks deducted
• Unattempted question: no penalty
• Marking more than one option: treated as an incorrect answer

Random guessing is therefore risky. However, if a candidate can eliminate one or more options and improve the probability of selecting the correct answer, an attempt may become more worthwhile.

UPSC CSE 2027 Mains Examination Syllabus

Candidates who qualify for the Preliminary Examination are admitted to the Main Examination.

The Mains Examination consists of nine conventional/essay-type papers.

Each paper is generally of three hours' duration.

Only 1,750 marks from the Mains written examination count towards the final ranking.

The remaining 600 marks are from the two qualifying language papers.

UPSC CSE Mains Paper I: Essay

Maximum Marks: 250

Candidates may be required to write essays on multiple topics.

The expectation is not merely to reproduce information. A good UPSC essay should demonstrate:

• Clear understanding of the topic
• Logical organization
• Depth of thought
• Balanced analysis
• Relevant examples
• Multiple dimensions
• Coherent arguments
• Appropriate conclusion

The essay paper is particularly important because it tests whether an aspirant can develop an argument rather than simply list facts.

UPSC CSE Mains Paper II: General Studies I

Indian Heritage and Culture, History and Geography of the World and Society

GS Paper I broadly covers three major areas:

Indian Heritage and Culture

Topics include:

• Indian art forms
• Literature
• Architecture
• Culture
• Ancient and medieval traditions
• Indian cultural heritage

Modern Indian History

The syllabus includes significant events, personalities and issues from approximately the middle of the eighteenth century until the present.

Important areas include:

• British expansion
• Colonialism
• Indian National Movement
• Important personalities
• Regional contributions
• Post-independence consolidation

World History

The syllabus includes major events from the eighteenth century onwards, such as:

• Industrial Revolution
• World Wars
• Nationalism
• Colonization
• Decolonization
• Political philosophies
• Changes in political boundaries
• Their effects on world society

Indian Society

Important areas include:

• Indian society
• Diversity of India
• Women and women's organizations
• Population issues
• Poverty
• Developmental issues
• Urbanization
• Effects of globalization
• Social empowerment
• Communalism
• Regionalism
• Secularism

Geography

GS I also covers:

• Physical geography
• Important geographical features
• Natural resources
• Industrial location
• Earthquakes
• Tsunamis
• Volcanic activity
• Cyclones
• Water bodies
• Changes in critical geographical features
• Flora and fauna
• Effects of geographical changes

UPSC CSE Mains Paper III: General Studies II

Governance, Constitution, Polity, Social Justice and International Relations

GS Paper II focuses on the functioning of the Indian state and India's relationship with the world.

Indian Constitution and Polity

Topics include:

• Constitution
• Historical foundations
• Evolution
• Features
• Amendments
• Significant provisions
• Basic structure
• Federalism
• Centre-State relations
• Separation of powers
• Parliament
• State legislatures
• Executive
• Judiciary
• Constitutional bodies
• Statutory bodies

Governance

Important areas include:

• Government policies
• Transparency
• Accountability
• E-governance
• Citizen charters
• Role of civil services
• Development processes
• NGOs
• Self-help groups
• Stakeholders in governance

Social Justice

Topics include:

• Welfare schemes
• Vulnerable sections
• Health
• Education
• Poverty
• Hunger
• Social-sector programmes
• Issues relating to marginalized groups

International Relations

The syllabus covers:

• India's neighbourhood
• Bilateral relations
• Regional groupings
• International institutions
• Global organizations
• International agreements
• India's foreign policy
• Effects of developed and developing countries' policies on India

UPSC CSE Mains Paper IV: General Studies III

Technology, Economic Development, Biodiversity, Environment, Security and Disaster Management

GS Paper III combines several important areas.

Indian Economy

Topics include:

• Economic development
• Growth
• Employment
• Inclusive growth
• Government budgeting
• Major economic policies
• Investment models
• Infrastructure
• Agriculture

Agriculture

Important areas include:

• Cropping patterns
• Irrigation
• Agricultural subsidies
• Minimum Support Price
• Food processing
• Land reforms
• Storage
• Supply chains
• E-technology in agriculture

Science and Technology

The syllabus covers:

• Developments in science and technology
• Applications
• Achievements of Indians
• Indigenization of technology
• New technologies
• Awareness of information technology
• Space technology
• Computers
• Robotics
• Nanotechnology
• Biotechnology

Environment

Topics include:

• Conservation
• Environmental pollution
• Environmental impact assessment
• Biodiversity
• Climate change
• Environmental challenges

Disaster Management

The syllabus includes:

• Disaster management
• Disaster preparedness
• Response
• Mitigation
• Institutional mechanisms

Internal Security

Important areas include:

• Internal security challenges
• Extremism
• Cybersecurity
• Money laundering
• Border management
• Organized crime
• Security challenges
• Role of external and non-state actors

UPSC CSE Mains Paper V: General Studies IV

Ethics, Integrity and Aptitude

GS Paper IV tests ethical reasoning and the ability to apply ethical principles to real-world situations.

Major areas include:

• Ethics and human interface
• Human values
• Attitude
• Emotional intelligence
• Contributions of moral thinkers and philosophers
• Public service values
• Probity in governance
• Integrity
• Impartiality
• Objectivity
• Accountability
• Transparency
• Ethical dilemmas
• Corporate governance
• Codes of ethics
• Codes of conduct

The paper also includes case studies, where candidates are expected to identify ethical issues and develop practical solutions.

UPSC CSE Mains Optional Subject

Candidates must select one optional subject.

The optional subject consists of two papers:

• Optional Paper I — 250 marks
• Optional Paper II — 250 marks

Total: 500 marks

The optional subject can therefore have a significant impact on the final ranking.

The standard of the optional examination is broadly at the honours degree level, meaning it is generally higher than a bachelor's degree but below a master's degree. For Engineering, Medical Science and Law, the standard corresponds broadly to the bachelor's degree level.

UPSC CSE Optional Subjects

The available optional subjects include:

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

Candidates can also choose a literature subject from the languages specified by UPSC.

The optional syllabus should be studied separately because every subject has its own detailed Paper I and Paper II syllabus.

UPSC CSE Mains Qualifying Language Papers

Paper A — Indian Language

Maximum Marks: 300

Paper A is a qualifying paper based on an Indian language included in the relevant Eighth Schedule provisions.

The paper broadly tests:

• Comprehension
• Precis writing
• Usage and vocabulary
• Short essays
• Translation

The qualifying standard is 25%.

Paper B — English

Maximum Marks: 300

The English paper is also qualifying.

It broadly tests:

• Comprehension
• Precis writing
• Usage and vocabulary
• Short essays

The qualifying standard is 25%.

Marks obtained in these two papers are not added to the merit total.

Who is exempt from Paper A?

The Indian Language paper is not compulsory for candidates belonging to certain states/regions specified in the examination rules, including candidates from:

• Arunachal Pradesh
• Manipur
• Meghalaya
• Mizoram
• Nagaland
• Sikkim

There is also a specified exemption for candidates with hearing impairment in the relevant benchmark-disability category who meet the conditions prescribed in the rules.

Candidates should check the CSE 2027 notification for the exact exemption provisions before applying.

Standard and Nature of the UPSC Mains Examination

The UPSC does not intend the Mains Examination to be a simple test of memory.

The examination is designed to assess the candidate's:

• Intellectual ability
• Understanding
• Analytical skills
• Ability to connect different issues
• Judgment
• Balanced reasoning
• Awareness of social and economic problems

For General Studies papers, UPSC expects questions to be answerable by a well-educated candidate without requiring specialized academic study.

This distinction is important.

UPSC preparation is therefore not simply about reading more books. It is about developing the ability to understand an issue, analyze it from different perspectives and present a balanced argument within a limited amount of time.

UPSC CSE 2027 Cut-Off and Movement Between Stages

The number of candidates progressing through the examination is linked to the number of vacancies.

Broadly, the examination rules provide for:

• Candidates admitted to Mains at around 12–13 times the number of vacancies
• Candidates called for the Personality Test at around twice the number of vacancies

These are not fixed marks or guaranteed numbers for CSE 2027. The actual cut-offs depend on the examination, vacancies and the Commission's applicable rules.

UPSC CSE 2027 Vacancies

The CSE 2027 vacancy figure is not yet available.

The latest reference point is CSE 2026, for which UPSC initially notified approximately 933 vacancies, including 33 vacancies reserved for Persons with Benchmark Disability. UPSC also stated that the final number could change after receiving firm vacancy figures from the relevant Cadre Controlling Authorities.

Therefore, aspirants should not treat 933 as the expected number of CSE 2027 vacancies.

The actual 2027 vacancy figure will be known with the CSE 2027 Examination Notice.

UPSC CSE 2027 Important Dates

The UPSC Annual Calendar 2027 was published on 20 May 2026. It provides the following schedule for the Civil Services Examination 2027.

Important note on these dates

These dates come from the UPSC Annual Calendar 2027 and should be treated as the currently scheduled dates.

The detailed Examination Notice released in January 2027 will be the authoritative document for the application process, vacancies, eligibility requirements, examination centres and any changes to the schedule. UPSC's annual calendar itself should therefore not be treated as a substitute for the examination notification.

UPSC CSE 2027 Final Merit Calculation

The final merit is based on:

Mains Merit Papers: 1,750 marks

plus

Personality Test: 275 marks

Therefore:

Final Merit = 1,750 + 275 = 2,025 marks

The Preliminary Examination does not contribute to this total.

Similarly, the 600 marks assigned to the two qualifying Mains language papers do not contribute to the final merit.

This makes the structure of the examination particularly important:

Prelims → Screening

Mains → Main written merit

Interview → Final ranking

UPSC CSE Tie-Breaking Rules

If two or more candidates obtain the same aggregate marks, the examination rules provide a prescribed order for resolving the tie.

Broadly, the comparison proceeds through:

1. Marks in the compulsory common papers and Personality Test taken together.
2. Marks in the compulsory common papers.
3. Age, with the senior candidate receiving preference.
4. Further resolution according to the applicable Commission rules if the tie remains.

Candidates should refer to the CSE 2027 Examination Notice for the final wording applicable to their examination cycle.

How to Use the UPSC CSE 2027 Syllabus

Knowing the syllabus is not enough. The real advantage comes from using it as a boundary for preparation.

1. Read the syllabus before starting books

Do not begin preparation by randomly collecting books, PDFs and coaching notes.

Start with the official syllabus.

For every subject, identify:

• What UPSC explicitly mentions
• What it does not mention
• Which topics overlap with other papers
• Which areas are repeatedly tested

2. Map every topic to the syllabus

Suppose you are studying Parliament.

Do not simply make notes titled:

“Parliament — Complete Notes.”

Instead, connect your notes to the syllabus:

GS II → Parliament and State Legislatures → structure, functioning, conduct of business, powers and privileges, issues arising out of these.

This makes your preparation more focused.

3. Use Previous Year Questions as the syllabus's practical interpretation

The syllabus often contains broad phrases such as:

• “issues arising out of their design and implementation”
• “effects of globalization”
• “important international institutions”
• “ethical dilemmas”

These phrases can appear too broad when you first read them.

Previous Year Questions show how UPSC converts those broad syllabus statements into actual questions.

Therefore, use this sequence:

Syllabus → Previous Year Questions → Basic sources → Current affairs → Notes → Revision

rather than:

Books → Coaching material → Endless PDFs → Random current affairs

4. Start solving previous year questions early

Do not wait until you finish the syllabus.

Attempt a few previous year questions even when you are at the beginning of preparation.

The purpose is not necessarily to score well.

It is to understand:

• How UPSC frames questions
• What level of knowledge is required
• How static and current affairs are connected
• What topics are repeatedly tested
• How much depth is actually necessary

Prelims and Mains Need Different Preparation

One of the biggest mistakes aspirants make is treating UPSC preparation as a single examination.

Prelims and Mains require different skills.

Prelims requires:

• Factual awareness
• Conceptual clarity
• Elimination skills
• Speed
• Accuracy
• Revision
• MCQ practice

Mains requires:

• Analytical thinking
• Answer writing
• Structure
• Examples
• Arguments
• Multiple perspectives
• Time management
• Concise expression

A candidate can be excellent at one and weak at the other.

Your preparation strategy should therefore eventually develop both skill sets.

The Most Important Numbers to Remember

UPSC CSE 2027 Syllabus: What Aspirants Should Do Now

Since the CSE 2027 notification is still pending, aspirants should not wait for January 2027 to begin syllabus-based preparation.

Use the latest officially available syllabus as your preparation framework.

A practical approach is:

Before starting

• Read the complete Prelims syllabus.
• Read all Mains syllabus headings.
• Select your optional subject.
• Download and analyze previous year papers.
• Identify overlap between Prelims and Mains.

During preparation

• Keep the syllabus beside your study material.
• Link current affairs to syllabus topics.
• Make short, revision-friendly notes.
• Solve previous year questions regularly.
• Practice Mains answer writing.
• Revise repeatedly instead of continuously adding new sources.

Before the examination

• Re-read the complete syllabus.
• Review every previous year question.
• Identify weak syllabus areas.
• Stop collecting unnecessary material.
• Focus on revision, testing and answer quality.

Final Takeaway

The UPSC Civil Services Examination syllabus is not merely a list of subjects. It defines the scope of the examination.

For CSE 2027, the most important distinction is that the detailed 2027 Examination Notice is still awaited. Until it is released, the latest official CSE syllabus remains the best reference for preparation. The UPSC Annual Calendar 2027 currently schedules the notification for 13 January 2027, the Preliminary Examination for 23 May 2027, and the Main Examination from 20 August 2027.

Do not prepare for UPSC by trying to know everything.

Prepare by knowing what UPSC asks, how it asks it, and how deeply you need to understand each part of the syllabus.

Read the syllabus. Map it to previous year questions. Build your sources around those boundaries. Then revise until the syllabus becomes a framework you can recall without looking at the page.

Official source: UPSC Annual Calendar 2027

For the final CSE 2027 syllabus, eligibility, vacancies and examination rules, always refer to the official UPSC notification once it is released.