Preparing for UPSC (Union Public Service Commission) exam requires extensive reading and understanding of a wide range of topics. There are many books available in the market that can be helpful for UPSC preparation. Here are some of the popular books that you can consider:

1. Indian Polity by M. Laxmikanth - This is one of the most recommended books for UPSC preparation. It covers the Indian political system, constitution, and governance.

2. Indian Economy by Ramesh Singh - This book covers various aspects of the Indian economy, including economic policies, budget, and economic reforms.

3. India's Struggle for Independence by Bipan Chandra - This book covers the Indian freedom struggle and the journey towards independence.

4. History of Modern India by Bipan Chandra - This book covers the period from the mid-18th century to the present day and is a comprehensive guide to modern Indian history.

5. Environment by Shankar IAS - This book covers various environmental issues, including climate change, biodiversity loss, and pollution.

6. General Studies Paper 1 by Arihant Publications - This book covers a wide range of topics, including history, geography, economics, and current affairs.

7. General Studies Paper 2 by Arihant Publications - This book covers various topics, including governance, international relations, and social justice.

8. Ethics, Integrity, and Aptitude by G. Subba Rao - This book covers various aspects of ethics, integrity, and aptitude, which are important for the UPSC exam.

9. India Year Book by Ministry of Information and Broadcasting - This book provides information on various aspects of the country, including government policies, infrastructure, and social development.

10. Yojana and Kurukshetra magazines - These magazines cover various aspects of governance, economics, and social development.

In conclusion, there are many books available in the market that can be helpful for UPSC preparation. It is important to choose the right books that cover all the relevant topics and provide a comprehensive understanding of the subject.