UPSC Syllabus 2027: Prelims & Mains, Paper-wise

The UPSC Civil Services syllabus is one of the most stable things about an otherwise unpredictable exam. The Mains framework has not changed since 2013, and the Prelims pattern has held since CSAT became qualifying in 2015. So if you are targeting CSE 2027, you can begin with the current syllabus today with full confidence. The authoritative text is always the annexure to the annual notification on upsc.gov.in, expected in the early months of 2027.

Exam Scheme at a Glance

Prelims Syllabus

GS Paper I (200 marks, 2 hours)

• Current events of national and international importance
• History of India and the Indian National Movement
• Indian and World Geography — physical, social, economic
• Indian Polity and Governance — Constitution, political system, Panchayati Raj, public policy, rights issues
• Economic and Social Development — sustainable development, poverty, inclusion, demographics
• Environmental ecology, biodiversity and climate change; General Science

CSAT Paper II (200 marks, 2 hours)

Comprehension; interpersonal and communication skills; logical reasoning and analytical ability; decision-making and problem-solving; general mental ability; basic numeracy and data interpretation (Class X level). You need 33% — 66 marks — to qualify. Both papers carry negative marking of one-third of the question's marks per wrong answer.

Mains: The Nine Papers

Papers A and B test comprehension, précis, usage and short essays in an Eighth Schedule language and English respectively; they are qualifying and their marks are not counted. The Essay paper asks for two essays, one from each section. The four GS papers are where the syllabus demands real breadth:

GS Paper I — Heritage, History, Geography, Society

• Indian art forms, literature and architecture from ancient to modern times
• Modern Indian history, the freedom struggle, post-independence consolidation
• World history from the 18th century — industrial revolution, world wars, decolonisation, political philosophies
• Indian society: diversity, women, population, poverty, urbanisation, globalisation, communalism, regionalism, secularism
• World physical geography, distribution of natural resources, geophysical phenomena

GS Paper II — Polity, Governance, Social Justice, IR

• The Constitution: evolution, features, amendments, basic structure; federalism and devolution
• Parliament, executive, judiciary; constitutional and statutory bodies; Representation of the People's Act
• Government policies, welfare schemes, health, education, poverty and hunger
• Governance, transparency, e-governance, role of civil services
• India and its neighbourhood; bilateral and global groupings; international institutions

GS Paper III — Economy, Science, Environment, Security

• Indian economy: growth, budgeting, inclusive growth; liberalisation; infrastructure and investment models
• Agriculture: cropping patterns, MSP, subsidies, PDS, food security, food processing, land reforms
• Science and technology; IT, space, robotics, biotechnology, IPR
• Environment: conservation, pollution, EIA; disaster management
• Internal security: extremism, cyber security, money laundering, border management, security agencies

GS Paper IV — Ethics, Integrity and Aptitude

• Ethics and human interface; attitude; emotional intelligence
• Foundational values for civil service: integrity, impartiality, objectivity, empathy
• Moral thinkers of India and the world; public service values; probity, RTI, codes of conduct, corruption
• Case studies applying all of the above

For the optional subject, UPSC offers 48 choices — 25 subjects plus the literature of the 22 Eighth Schedule languages and English — each with two papers of 250 marks.

How to Use the Syllabus as a Preparation Tool

1. Print it and keep it visible. Every book chapter, note and current-affairs item should map to a syllabus line. If it maps to nothing, drop it.
2. Break lines into micro-topics. "Inclusive growth and issues arising from it" becomes a checklist of schemes, data and debates you can actually revise.
3. Map previous-year questions to syllabus lines. Ten years of PYQs tell you which phrases UPSC returns to repeatedly and at what depth.
4. Filter current affairs through it. News matters only when it attaches to a syllabus theme — that single habit halves your reading load.
5. Recheck against the 2027 notification. Changes are rare, but the notification on upsc.gov.in is the final word on syllabus, eligibility and dates.