UPSC Prelims Syllabus: GS Paper 1 and Paper 2 CSAT

The Union Public Service Commission (UPSC) Civil Services Preliminary Examination is the first stage of the Civil Services Examination (CSE). It is conducted to shortlist candidates for the Main Examination. The Preliminary Examination tests a candidate’s understanding of a wide range of subjects, including history, geography, Indian polity, economy, environment, science and current affairs. It also evaluates aptitude, logical reasoning, comprehension and basic numerical ability through the Civil Services Aptitude Test (CSAT).

The UPSC Prelims Syllabus is divided into two compulsory papers: General Studies Paper I and General Studies Paper II (CSAT). Both papers carry 200 marks each, but their roles are different. General Studies Paper I determines the cut-off for qualifying for the Main Examination, while CSAT is qualifying in nature. This article explains the official syllabus of both papers, provides a subject-wise breakdown and highlights important points that candidates should understand while preparing for CSE.

UPSC Prelims Syllabus: Overview

The Preliminary Examination consists of two objective-type papers. Each paper carries 200 marks and has a duration of two hours. Candidates must appear in both papers to be considered for evaluation.

Both question papers are set in Hindi and English. The marks obtained in the Preliminary Examination are not counted towards the final merit list. The examination is only a screening test for admission to the Main Examination.

UPSC Prelims Syllabus: General Studies Paper I

General Studies Paper I carries 200 marks and covers seven broad areas. These include current events, history, geography, Indian polity, economic and social development, environment and general science.

The following sections explain these subjects in greater detail to help candidates understand the scope of the syllabus. The subtopics are a preparation-oriented breakdown of the official syllabus and should not be treated as a separate exhaustive list issued by UPSC.

1. Current Events of National and International Importance

Current affairs form an important part of General Studies Paper I. The syllabus covers events and developments of national and international importance. Questions may relate to government policies, important institutions, international organisations, economic developments, science and technology, environment, reports, awards and significant national or global events.

Important areas to follow include:

• Major national developments and important government decisions.
• Government schemes, programmes and policy initiatives.
• Important constitutional, legal and administrative developments.
• International organisations and their activities.
• India’s relations with other countries and important international agreements.
• Major international events, conflicts, summits and conferences.
• Economic developments, important reports and indices.
• Science and technology developments, including space research and biotechnology.
• Environmental conventions, climate-related developments and conservation initiatives.
• Important appointments, awards, books, sports events and personalities where relevant to the syllabus.

Current affairs should not be studied in isolation. Candidates should try to understand the background of an event and connect it with subjects such as polity, history, geography, economy, science and environment.

2. History of India and Indian National Movement

The history portion of the syllabus covers the history of India and the Indian National Movement. Candidates should develop an understanding of important historical developments, political changes, social and religious movements, cultural contributions and the events that led to India’s independence.

The preparation can broadly be divided into the following areas:

Ancient Indian History

• Prehistoric cultures and the Indus Valley Civilisation.
• Vedic period and the development of early Indian society.
• Religious movements, including Buddhism and Jainism.
• Mahajanapadas, the Mauryan Empire and post-Mauryan developments.
• Gupta period and other important ancient Indian kingdoms.
• Ancient Indian art, architecture, literature, science and philosophy.

Medieval Indian History

• Early medieval kingdoms and regional powers.
• Delhi Sultanate and its major dynasties.
• Mughal Empire and its administration.
• Vijayanagara and Bahmani kingdoms.
• Maratha power and other regional states.
• Bhakti and Sufi movements.
• Medieval Indian art, architecture, literature and culture.

Modern Indian History

• Arrival of European trading companies in India.
• Expansion of British political control and major battles.
• Important administrative and constitutional developments under British rule.
• Economic policies and their impact on Indian society.
• Social and religious reform movements of the nineteenth century.
• Revolt of 1857 and its causes and consequences.
• Rise of Indian nationalism and formation of the Indian National Congress.
• Moderate and Extremist phases of the national movement.
• Swadeshi Movement, Home Rule Movement and revolutionary activities.
• Gandhian movements, including Non-Cooperation, Civil Disobedience and Quit India.
• Contributions of important leaders, organisations and revolutionary groups.
• Constitutional developments, negotiations and events leading to independence.

Indian National Movement

Special attention should be given to the freedom struggle, its important phases, organisations, leaders, movements and events. Candidates should understand not only the chronology of events but also their causes, objectives, methods and consequences.

3. Indian and World Geography

The geography syllabus covers the physical, social and economic geography of India and the world. It requires an understanding of geographical features, natural processes, resources, climate, population and economic activities.

Physical Geography

• Origin and structure of the Earth.
• Interior of the Earth, rocks and minerals.
• Continents, oceans and major landforms.
• Plate tectonics, earthquakes, volcanoes and other geomorphic processes.
• Atmosphere, temperature, pressure, winds and rainfall.
• Climate, monsoon, cyclones and climatic regions.
• Ocean currents, tides and marine resources.
• Soils, natural vegetation and biodiversity distribution.

Indian Geography

• Physiographic divisions of India.
• Himalayan and Peninsular river systems.
• Drainage systems, lakes and important water bodies.
• Indian monsoon and climatic regions.
• Types and distribution of soils in India.
• Natural vegetation, forests and wildlife distribution.
• Agriculture, major crops and cropping patterns.
• Mineral and energy resources.
• Industries, transport and communication networks.
• Population distribution, migration and urbanisation.

World Geography

• Continents, oceans, major mountain ranges, plateaus and plains.
• Important rivers, lakes, deserts and geographical regions.
• Climate zones and natural vegetation of the world.
• Distribution of important natural resources.
• Major agricultural and industrial regions.
• Important straits, seas, gulfs, canals and international geographical locations.
• Population distribution and major patterns of human settlement.

Social and Economic Geography

Social geography includes population, settlements, migration and human activities. Economic geography deals with the distribution of resources, agriculture, industries, transport, trade and other economic activities across India and the world.

4. Indian Polity and Governance

Indian Polity and Governance is an important part of General Studies Paper I. It deals with the Indian Constitution, political institutions, governance arrangements, public policy and rights-related issues.

Important areas include:

• Historical background and making of the Indian Constitution.
• Salient features of the Constitution and its Preamble.
• Fundamental Rights, Directive Principles of State Policy and Fundamental Duties.
• Union and State executive, including the President, Governor, Prime Minister and Chief Minister.
• Parliament and State Legislatures.
• Supreme Court, High Courts and the judicial system.
• Centre-State relations and federalism.
• Constitutional and statutory bodies.
• Election Commission and electoral processes.
• Panchayati Raj Institutions and Urban Local Bodies.
• Important constitutional amendments.
• Public policy, governance and government programmes.
• Transparency, accountability and citizens’ rights.
• Right to Information and other important rights-related developments.

Candidates should also follow important constitutional developments, landmark Supreme Court judgments, major legislative changes and governance-related initiatives.

5. Economic and Social Development

This section covers the basic concepts of the Indian economy and important issues relating to economic and social development. The official syllabus specifically mentions sustainable development, poverty, inclusion, demographics and social sector initiatives.

Indian Economy

• Basic concepts of the Indian economy.
• National income, GDP, GNP and related concepts.
• Economic growth and economic development.
• Inflation, deflation and monetary policy.
• Fiscal policy, taxation and government budgeting.
• Banking system and financial institutions.
• RBI and its major functions.
• Employment, unemployment and labour market issues.
• Agriculture, industry and services sectors.
• Infrastructure and economic development.
• External trade, balance of payments and foreign investment.

Economic and Social Development

• Poverty and inequality.
• Inclusive growth and sustainable development.
• Human development and quality of life.
• Demographic trends and population-related issues.
• Education, health and nutrition.
• Women and child development.
• Social security and welfare programmes.
• Financial inclusion and access to basic services.
• Rural development and urban development.
• Government initiatives for weaker and disadvantaged sections.

Questions in this area may also be linked to current economic developments, government reports, budget announcements and important social sector programmes.

6. Environmental Ecology, Biodiversity and Climate Change

The environment section covers general issues relating to environmental ecology, biodiversity and climate change. UPSC specifies that these topics do not require subject specialisation. However, candidates should understand the basic scientific concepts and their application to current environmental issues.

Environment and Ecology

• Basic concepts of ecology and ecosystems.
• Food chains, food webs and ecological pyramids.
• Ecological succession and ecological balance.
• Biogeochemical cycles.
• Natural resources and their conservation.
• Environmental pollution and its control.
• Environmental impact assessment and related issues.

Biodiversity and Conservation

• Meaning and levels of biodiversity.
• Importance of biodiversity and ecosystem services.
• Threats to biodiversity and species extinction.
• Endangered and threatened species.
• National parks, wildlife sanctuaries and biosphere reserves.
• Conservation programmes and protected areas in India.
• International conventions and organisations related to biodiversity.

Climate Change and Environmental Issues

• Global warming and greenhouse gases.
• Climate change causes and consequences.
• Climate change mitigation and adaptation.
• International climate agreements and conventions.
• Ozone layer depletion and related environmental concerns.
• Desertification, land degradation and deforestation.
• Renewable energy and sustainable development.
• Important environmental initiatives and policies in India.

Candidates should connect basic environmental concepts with current developments, such as international climate conferences, conservation programmes, environmental reports and important species-related news.

7. General Science

The General Science portion tests basic scientific understanding and awareness of developments in science and technology. Candidates are generally expected to understand fundamental concepts rather than study advanced scientific theories in great detail.

Important areas include:

• Physics: Basic concepts of motion, force, energy, heat, light, sound, electricity and magnetism.
• Chemistry: Elements, compounds, acids, bases, salts, metals, non-metals and common chemical reactions.
• Biology: Human body, nutrition, diseases, immunity, genetics, cells, microorganisms, plants and basic life processes.
• Health and Biotechnology: Vaccines, medical research, biotechnology applications and important public health developments.
• Space and Technology: Satellites, space missions, Indian space programmes and important technological developments.
• Information Technology: Basic developments in computers, artificial intelligence, communication technologies and cybersecurity.

Current developments in science and technology should be studied along with their basic scientific principles and practical applications.

UPSC Prelims Syllabus: General Studies Paper II (CSAT)

General Studies Paper II, commonly known as CSAT, is the second paper of the Preliminary Examination. It carries 200 marks and has a duration of two hours. Unlike General Studies Paper I, CSAT is qualifying in nature. Candidates must secure at least 33% marks, equivalent to 66 marks out of 200, to qualify in this paper.

1. Comprehension

This section tests the ability to read and understand written passages. Candidates are required to identify the central idea, understand arguments, draw logical conclusions and answer questions based on the given information.

2. Interpersonal Skills and Communication Skills

This area relates to understanding communication and interactions between individuals. Questions may test the ability to interpret situations, understand communication and identify appropriate responses.

3. Logical Reasoning and Analytical Ability

Logical reasoning tests the ability to identify patterns, understand relationships and draw conclusions from given information. Analytical ability involves examining facts and solving problems in a systematic manner.

Common preparation areas include:

• Statements and conclusions.
• Statements and assumptions.
• Arguments and inferences.
• Logical sequences and arrangements.
• Blood relations.
• Direction and distance.
• Coding and decoding.
• Series and pattern recognition.
• Puzzles and analytical reasoning.

4. Decision-Making and Problem-Solving

This section tests the ability to understand a situation, identify the available choices and select an appropriate course of action. Candidates should practise questions that require practical judgement and systematic problem-solving.

5. General Mental Ability

General mental ability covers basic reasoning and problem-solving skills. It may involve numerical reasoning, patterns, sequences, logical relationships and other questions that test mental alertness.

6. Basic Numeracy

Basic numeracy is based on mathematical concepts up to the Class X level. Candidates should be comfortable with fundamental calculations and numerical relationships.

Important areas for preparation include:

• Number systems.
• Natural numbers, integers, fractions and decimals.
• Divisibility rules and factors.
• HCF and LCM.
• Ratio and proportion.
• Percentage.
• Average.
• Profit and loss.
• Simple and compound interest.
• Time and work.
• Time, speed and distance.
• Basic algebra and arithmetic applications.

7. Data Interpretation

Data interpretation tests the ability to read, analyse and draw conclusions from numerical information presented in different formats.

Important areas include:

• Tables and tabular data.
• Bar graphs and line graphs.
• Pie charts.
• Data comparison and analysis.
• Percentage-based calculations.
• Data sufficiency.
• Interpretation of numerical information.

UPSC Prelims Syllabus: Important Points About CSAT

• CSAT carries 200 marks and has a duration of two hours.
• It is a qualifying paper, not a merit-ranking paper.
• Candidates must score at least 33%, or 66 marks out of 200.
• Marks obtained in CSAT are not added to the General Studies Paper I score for determining the Prelims cut-off.
• Questions are objective and multiple-choice in nature.
• Basic numeracy and data interpretation are prescribed at the Class X level.
• It is compulsory to appear in both Preliminary Examination papers.

Negative Marking in UPSC Prelims

UPSC follows a negative marking system in both General Studies Paper I and CSAT. 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. If a candidate marks more than one answer for a question, it is treated as an incorrect answer, even if one of the marked options is correct.

No marks are deducted for questions left unanswered. Candidates should therefore read the instructions carefully and avoid marking multiple options for a question.

Is UPSC Prelims Paper I More Important Than CSAT?

Both papers are compulsory, but they serve different purposes. General Studies Paper I is used to determine the Preliminary Examination cut-off, while CSAT is only a qualifying paper.

A candidate must secure at least 33% marks in CSAT and also obtain the required cut-off marks in General Studies Paper I. Scoring well in General Studies Paper I cannot compensate for failing to secure the minimum qualifying marks in CSAT.

For example, a candidate who scores 110 marks in General Studies Paper I but obtains only 60 marks in CSAT will not qualify for the Main Examination because the minimum CSAT requirement has not been met.

Are UPSC Prelims Marks Counted in the Final Merit List?

No. Marks obtained in the Preliminary Examination are not included in the final merit list. The Preliminary Examination is only a screening test to select candidates for the Main Examination.

The final merit list is prepared on the basis of marks obtained in the merit-based written papers of the Main Examination and the Interview/Personality Test. Therefore, candidates should treat Prelims as an essential qualifying stage rather than a stage that contributes directly to their final ranking.

How to Prepare for UPSC Prelims According to the Syllabus?

A clear understanding of the syllabus should be the starting point of Preliminary Examination preparation. Since the syllabus covers several subjects, candidates should avoid studying without a defined plan. The following approach can help organise preparation:

1. Read the official syllabus carefully: Keep a copy of the UPSC syllabus and refer to it while selecting books and study materials.
2. Build strong basic concepts: Start with standard school-level textbooks and reliable reference books for history, geography, polity, economy and science.
3. Study current affairs with static subjects: Connect important current events with the relevant subjects instead of treating current affairs as an isolated topic.
4. Practise previous years’ question papers: Previous years’ questions help candidates understand the nature, wording and broad coverage of the examination.
5. Revise regularly: Regular revision is important because the syllabus covers a large number of subjects and factual details.
6. Practise mock tests: Mock tests help improve time management, accuracy and question-selection skills.
7. Do not ignore CSAT: Candidates should practise CSAT regularly, particularly if they are not comfortable with mathematics, comprehension or reasoning.
8. Analyse mistakes: After each test, identify weak areas and understand why an answer was incorrect rather than simply checking the score.

UPSC Prelims Syllabus 2027: Official PDF

The official syllabus is published by UPSC as part of the Civil Services Examination notification. Candidates should download and read the notification carefully rather than relying only on summaries or coaching material.

The CSE 2027 notification is scheduled for 13 January 2027 in the UPSC Annual Calendar 2027. Until the year-specific notification is published, candidates can use the latest published CSE examination notice as the reference for the syllabus. Any changes made in the 2027 notification will take precedence.

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

Check the UPSC Annual Examination Calendar 2027

Frequently Asked Questions (FAQs) on UPSC Prelims Syllabus

1. How many papers are there in UPSC Prelims 2027?

There are two compulsory papers in the UPSC Preliminary Examination: General Studies Paper I and General Studies Paper II (CSAT). Each paper carries 200 marks and has a duration of two hours.

2. What are the subjects in UPSC Prelims Paper I?

General Studies Paper I covers current events, history of India and the Indian National Movement, Indian and World Geography, Indian Polity and Governance, Economic and Social Development, Environmental Ecology, Biodiversity, Climate Change and General Science.

3. What is the syllabus of UPSC CSAT 2027?

The CSAT syllabus includes comprehension, interpersonal and communication skills, logical reasoning, analytical ability, decision-making, problem-solving, general mental ability, basic numeracy and data interpretation.

4. Is CSAT qualifying in UPSC Prelims?

Yes. CSAT is a qualifying paper. Candidates must secure at least 33% marks, equivalent to 66 marks out of 200, to qualify in this paper.

5. Is there negative marking in UPSC Prelims?

Yes. One-third of the marks assigned to a question is deducted for every incorrect answer in both Preliminary Examination papers. No marks are deducted for unanswered questions.

6. Are both UPSC Prelims papers compulsory?

Yes. Candidates must appear in both General Studies Paper I and General Studies Paper II. A candidate who does not appear in either paper will be disqualified from the Preliminary Examination.

7. Are UPSC Prelims marks counted in the final merit list?

No. Preliminary Examination marks are not counted in the final merit list. Prelims is a screening examination for selecting candidates for the Main Examination.

8. What is the level of mathematics in UPSC CSAT?

The official syllabus prescribes basic numeracy and data interpretation at the Class X level. It includes basic mathematical concepts and the interpretation of tables, charts, graphs and other numerical information.

9. Is there a separate syllabus for UPSC Prelims 2027?

The CSE 2027 notification will provide the applicable examination rules and syllabus. Until it is published, candidates can refer to the latest published UPSC Civil Services Examination syllabus for preparation, while checking the 2027 notification for any changes.

10. When will UPSC Prelims 2027 be conducted?

According to the UPSC Annual Calendar 2027, the Civil Services Preliminary Examination is scheduled for 23 May 2027. The calendar also lists 13 January 2027 as the notification date. These dates are subject to change by the Commission.

Official Sources

The syllabus and examination details in this article are based on the official documents and information published by the Union Public Service Commission.

1. UPSC Civil Services Examination 2026 – Official Examination Notice and Syllabus (PDF)
2. UPSC Annual Calendar 2027
3. UPSC Examination Division – Examination Scheme and Frequently Asked Questions
4. UPSC – Civil Services (Preliminary) Examination 2026

Note: The subject headings and qualifying requirements in this article follow the latest published UPSC Civil Services Examination syllabus available for reference. Candidates preparing for CSE 2027 should verify the final syllabus and examination rules in the official 2027 notification before the examination.