UPSC CSE Syllabus 2026 — Complete Prelims, Mains and Interview Guide

The Civil Services Examination conducted by the Union Public Service Commission (UPSC) is the entry route to the Indian Administrative Service, Indian Police Service, Indian Foreign Service and over twenty other Group A and Group B central services. Around ten lakh candidates register each year for roughly a thousand vacancies, which makes understanding the syllabus precisely — not approximately — the first real advantage an aspirant can gain.

This guide covers the full UPSC CSE syllabus across all three stages, the marks structure, negative marking, the optional subject system, and how the pieces fit together into a preparation plan.

UPSC CSE Exam Structure

The examination runs in three sequential stages. Each stage eliminates candidates, and only the final two stages contribute to the merit list.

The single most misunderstood point: Prelims marks are discarded entirely. The Preliminary Examination decides only who writes the Mains. Your final rank is built from 1750 Mains marks plus 275 interview marks.

Stage 1 — Preliminary Examination Syllabus

Prelims consists of two papers, both objective, both held on the same day.

Paper I — General Studies

• Questions: 100
• Marks: 200
• Duration: 2 hours
• Negative marking: one-third of the marks assigned to that question

Syllabus coverage:

• Current events of national and international importance
• History of India and the Indian National Movement
• Indian and World Geography — physical, social and economic geography of India and the world
• Indian Polity and Governance — Constitution, political system, Panchayati Raj, public policy, rights issues
• Economic and Social Development — sustainable development, poverty, inclusion, demographics, social sector initiatives
• General issues on Environmental Ecology, Biodiversity and Climate Change (no subject specialisation required)
• General Science

Paper II — CSAT (Civil Services Aptitude Test)

• Questions: 80
• Marks: 200
• Duration: 2 hours
• Nature: Qualifying only — you must score 33 percent (66 marks)
• Negative marking: one-third of the marks assigned to that question

Syllabus coverage:

• Comprehension
• Interpersonal skills including communication skills
• Logical reasoning and analytical ability
• Decision making and problem solving
• General mental ability
• Basic numeracy — numbers and their relations, orders of magnitude (Class X level)
• Data interpretation — charts, graphs, tables, data sufficiency (Class X level)

CSAT is qualifying, but treating it as unimportant is the most common self-inflicted failure in this exam. Candidates from non-mathematical backgrounds regularly clear GS Paper I comfortably and then fall short of 66 marks in CSAT, ending their attempt outright. Sit at least a dozen full CSAT mocks regardless of your confidence level.

Note that decision-making questions in CSAT historically carry no negative marking, though you should confirm this against the instructions in your specific question paper.

Stage 2 — Main Examination Syllabus

The Mains consists of nine descriptive papers written over five to seven days. Two are qualifying; seven count towards merit.

Each paper runs for three hours. Papers A and B require a minimum qualifying percentage set by the Commission; if you fail either, your merit papers are not evaluated at all. Candidates from certain states and those with specified disabilities are exempted from Paper A.

Essay Paper (250 marks)

Candidates write two essays, one from each of two sections, typically 1000 to 1200 words each. Marks are awarded for keeping close to the subject, arranging ideas in an orderly fashion, and writing concisely. This is the least prepared-for and most underestimated paper — a difference of forty marks in the essay moves ranks substantially.

General Studies Paper I — Indian Heritage and Culture, History and Geography of the World and Society

• Indian culture — art forms, literature and architecture from ancient to modern times
• Modern Indian history from the middle of the eighteenth century — significant events, personalities, issues
• The Freedom Struggle — its various stages and important contributors from different parts of the country
• Post-independence consolidation and reorganisation within the country
• History of the world from the eighteenth century — industrial revolution, world wars, redrawing of national boundaries, colonisation, decolonisation, political philosophies such as communism, capitalism and socialism
• Salient features of Indian society, diversity of India
• Role of women and women's organisations, population and associated issues, poverty and developmental issues, urbanisation and their problems and remedies
• Effects of globalisation on Indian society
• Social empowerment, communalism, regionalism and secularism
• Salient features of world physical geography
• 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
• Important geophysical phenomena such as earthquakes, tsunamis, volcanic activity, cyclones; geographical features and changes in critical geographical features including water bodies and ice caps

General Studies Paper II — Governance, Constitution, Polity, Social Justice and International Relations

• Indian Constitution — historical underpinnings, evolution, features, amendments, significant provisions and basic structure
• Functions and responsibilities of the Union and the States, issues and challenges of the federal structure, devolution of powers and finances to local levels
• Separation of powers between various organs, dispute redressal mechanisms and institutions
• Comparison of the Indian constitutional scheme with that of other countries
• Parliament and State Legislatures — structure, functioning, conduct of business, powers and privileges
• Structure, organisation and functioning of the Executive and the Judiciary
• Appointment to various constitutional posts, powers, functions and responsibilities of various constitutional bodies
• Statutory, regulatory and various quasi-judicial bodies
• Government policies and interventions for development in various sectors and issues arising out of their design and implementation
• Development processes and the development industry — the role of NGOs, self-help groups, various groups and associations, donors, charities, institutional and other stakeholders
• Welfare schemes for vulnerable sections and the performance of these schemes
• Issues relating to development and management of Social Sector or Services relating to Health, Education and Human Resources
• Issues relating to poverty and hunger
• Important aspects of governance, transparency and accountability, e-governance applications, models, successes, limitations and potential; citizens' charters, transparency and accountability and institutional and other measures
• Role of civil services in a democracy
• India and its neighbourhood relations
• Bilateral, regional and global groupings and agreements involving India or affecting India's interests
• Effect of policies and politics of developed and developing countries on India's interests
• Important international institutions, agencies and their structure and mandate

General Studies Paper III — Technology, Economic Development, Biodiversity, Environment, Security and Disaster Management

• Indian Economy and issues relating to planning, mobilisation of resources, growth, development and employment
• Inclusive growth and issues arising from it
• Government Budgeting
• Major crops and cropping patterns, irrigation systems, storage, transport and marketing of agricultural produce, e-technology in the aid of farmers
• Issues of buffer stocks and food security, technology missions, economics of animal rearing
• Food processing and related industries in India — scope, significance, location, upstream and downstream requirements, supply chain management
• Land reforms in India
• Effects of liberalisation on the economy, changes in industrial policy and their effects on industrial growth
• Infrastructure — energy, ports, roads, airports, railways
• Investment models
• Science and Technology developments and their applications and effects in everyday life
• Achievements of Indians in science and technology, indigenisation of technology and developing new technology
• Awareness in the fields of IT, Space, Computers, Robotics, Nano-technology, Biotechnology and issues relating to intellectual property rights
• Conservation, environmental pollution and degradation, environmental impact assessment
• Disaster and disaster management
• Linkages between development and spread of extremism
• Role of external state and non-state actors in creating challenges to internal security
• Challenges to internal security through communication networks, role of media and social networking sites, basics of cyber security, money laundering and its prevention
• Security challenges and their management in border areas, linkages of organised crime with terrorism
• Various security forces and agencies and their mandate

General Studies Paper IV — Ethics, Integrity and Aptitude

• Ethics and Human Interface — essence, determinants and consequences of ethics in human actions; dimensions of ethics; ethics in private and public relationships
• Human Values — lessons from the lives and teachings of great leaders, reformers and administrators; role of family, society and educational institutions in inculcating values
• Attitude — content, structure, function; its influence and relation with thought and behaviour; moral and political attitudes; social influence and persuasion
• Aptitude and foundational values for Civil Service — integrity, impartiality and non-partisanship, objectivity, dedication to public service, empathy, tolerance and compassion towards the weaker sections
• Emotional intelligence — concepts, and their utilities and application in administration and governance
• Contributions of moral thinkers and philosophers from India and the world
• Public or Civil Service Values and Ethics in Public Administration — status and problems, ethical concerns and dilemmas in government and private institutions, laws, rules, regulations and conscience as sources of ethical guidance
• Accountability and ethical governance, strengthening of ethical and moral values in governance
• Ethical issues in international relations and funding, corporate governance
• 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, Codes of Conduct, Citizen's Charters, Work Culture, Quality of Service Delivery, Utilisation of Public Funds, challenges of corruption
• Case Studies on the above issues

Roughly half of GS Paper IV is case studies, which reward practised judgement rather than memorised theory.

Optional Subject (Papers VI and VII, 250 marks each)

Candidates choose one optional subject with two papers, together worth 500 marks — nearly a quarter of the merit total. UPSC offers a list of optional subjects covering the humanities, sciences, engineering, medical science, management, commerce and law, along with the literature of a range of Indian languages and English.

Choose based on genuine interest, availability of study material and overlap with the GS papers, not on hearsay about scoring trends. The optional list and detailed topic-wise syllabus for each subject are published in the official UPSC notification; read them for the subject you are considering before committing.

Stage 3 — Personality Test

Candidates who clear the Mains are called for the Personality Test, worth 275 marks. This is not a knowledge examination. The board assesses mental alertness, critical powers of assimilation, clear and logical exposition, balance of judgement, variety and depth of interest, ability for social cohesion and leadership, and intellectual and moral integrity.

Your Detailed Application Form — hometown, education, hobbies, work experience, service preferences — forms the backbone of most questions.

UPSC CSE Eligibility

• Nationality: Indian citizen for IAS and IPS. Other services also admit subjects of Nepal and Bhutan, Tibetan refugees who came to India before 1 January 1962, and persons of Indian origin who migrated from specified countries with the intention of permanently settling in India
• Educational Qualification: Bachelor's degree in any discipline from a recognised university. Final-year candidates may apply for the Preliminary Examination
• Age Limit: 21 to 32 years for General category, reckoned as on 1 August of the examination year. Relaxations apply for OBC, SC, ST, PwBD and ex-servicemen as per rules
• Number of Attempts: 6 for General and EWS, 9 for OBC, unrestricted for SC and ST candidates up to the prescribed age limit. PwBD candidates receive additional attempts as specified

Appearing in the Preliminary Examination counts as an attempt. Registering without appearing does not.

How to Prepare for UPSC CSE

Read the syllabus as a checklist, not as background. Print it. Every topic above corresponds to questions that have been asked. Aspirants who read newspapers and standard books without mapping content back to specific syllabus lines accumulate volume without coverage.

Build one integrated base for Prelims and Mains. The GS Paper I prelims syllabus overlaps heavily with Mains GS I, II and III. Preparing them as separate silos doubles the work for no gain. Study a topic once, then practise it in both objective and answer-writing formats.

Start answer writing early. The Mains is a writing examination under severe time pressure — roughly seven to eight minutes per answer. Candidates who postpone answer practice until after Prelims results consistently underperform relative to their knowledge.

Do not skip CSAT. Two hours a week is sufficient for most candidates and eliminates the single most avoidable cause of elimination.

Revise on a fixed cycle. The syllabus is too large to hold without structured revision. Most successful candidates revise core material three or more times before the examination rather than reading new sources.

Treat current affairs as syllabus-linked, not as news. Follow developments that connect to polity, economy, environment, science, governance and international relations. General news consumption without that filter is time spent poorly.

Important Note

The syllabus above reflects the structure published by UPSC in its Civil Services Examination notification. The Commission publishes the authoritative syllabus, exam pattern, optional subject list and eligibility conditions in the official notification each year. Always read the current notification on upsc.gov.in before beginning preparation, and verify the age limit, attempt limit and optional subject list applicable to your cycle.

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