UPSC Mains 2026: All 9 Papers Explained - What to Write and How to Score

The second major step towards becoming an IAS officer, IPS officer or IFS officer is UPSC Mains. All the students who have passed the Prelims exam will be required to appear for the Mains exam. There are 9 papers for this exam. Some papers are purely qualifying, others will award marks which will contribute to the final score. 

The prospect of 9 papers can be frightening for many students. But do not worry. If you know what each paper is and what you should write, it will be much easier. In this blog, all 9 papers will be explained in simple words and you will also get to know the best books for upsc preparation for each paper.

All 9 Papers at a Glance

This is a straightforward table detailing all 9 papers, the number of marks in each paper and whether they are included in your final mark.

Papers A and B are language papers. All you have to do is get them past. All the remaining 7 papers are included in your merit list from Essay to Optional Paper 2. This brings the total number of marks that count to 1750.

Read More - UPSC Mains 2026 Registration: Dates, Documents and DAF Form Guide

Paper 1: Essay Writing

The total marks of the Essay paper are 250. UPSC provides you with two sets of topics and you need to choose one topic from each set. You are required to write two essays in all. The marks for each essay are out of a total of 125. 

Many students fail to pay attention to the essay paper. That's a huge error. A well written essay will score you 30-40 extra marks compared to other students. The best essay writing books for upsc will help you to organize your thoughts, provide good examples and write in a logical fashion that the examiner will appreciate. 

GS Paper 1: History, Geography and Society

This paper comprises three major topics, Indian History, World Geography and Indian Society. History gets the highest proportion of questions. So, it is vital to have good indian history books for upsc. 

For History, use NCERT books from class 6 to 12. Tamil Nadu State Board books are also popular among the toppers for ancient and medieval history. The following method is your upsc mains strategy for this paper: Make short notes of important events and write timelines.

GS Paper 2: Polity and Governance

Indian Polity, Constitution, Government Schemes, International Relations, Governance are covered in GS Paper 2. This is one of the papers which can bring you maximum marks with proper preparation. 

Indian Polity by “ ” is the best indian polity book for upsc. It is recommended by almost all the toppers of UPSC. It gives an explanation of the Constitution, Parliament, President and all government bodies, in very simple language. It is also advisable to read about the government schemes from the official government website and newspapers such as The Hindu and Indian Express.

GS Papers 3 and 4: Economy, Environment, Ethics

GS Paper 3 includes Economy, Agriculture, Science and Technology, Environment and Internal Security. In G.S. Paper 4, you will be studying Ethics, Integrity and Aptitude. Each paper is worth 250 marks. 

Ethics is a special paper as it contains case studies. You need to interpret the situation and respond in a balanced and honest way. Students score very high on this, using examples from the real life in India and writing clearly.

Optional Papers (Papers 6 and 7)

You will have a choice of one subject for your option. Paper 6 and Paper 7 are both from the same subject. There are 250 marks available for each, making 500 marks available for the optional. 

These optional subjects are popular, such as Public Administration, History, Geography, Sociology and Political Science. Choose the area that you have the greatest interest in and that there is good study material in. Your upsc mains strategy for optional should be to write in own words and practise past year questions weekly.

Best UPSC Preparation Books — Quick Reference

Best books for Upsc preparation paper-wise are given as follows: These are trusted by thousands of students every year.

Use NCERT books as foundation books. These are the top most general studies book for upsc. After mastering the basics, you can go on to more advanced books. Keep in mind that it is better to read one book well than five books quickly.

How to Write Better Answers — Paper-wise Tips

UPSC Mains writing is not like school exams. It's not enough to know the answer, you have to do it well. The following are general guidelines for writing each paper.

Writing answers in small paragraphs is a good upsc mains strategy. Avoid using complicated sentences. Include diagrams and/or flowcharts as necessary. Answer sheets are read by hundreds of examiners, and a neat and clear answer will always stand out.

Conclusion

UPSC Mains 2026 will seem difficult with 9 papers, but it will be easy, if you take it one paper at a time. Choose the correct books for upsc preparation, have a clear upsc mains strategy and practice writing daily. Every good book whether it is essay writing books for upsc, an indian polity book for upsc, or indian history books for upsc will bring you nearer to your dream of becoming an IAS officer. 

Be consistent, be calm and continue to write. Wishing you all the best for UPSC Mains 2026!