Preparing for the UPSC exam requires a comprehensive understanding of various subjects and topics. The National Council of Educational Research and Training (NCERT) books are widely recommended for UPSC preparation due to their quality content and holistic coverage of the syllabus. Here are the key NCERT books that can be referred to while preparing for the UPSC exam:


- Class 6: Our Past
- Class 7: Our Past - I
- Class 8: Our Past - II and III
- Class 9: India and the Contemporary World - I
- Class 10: India and the Contemporary World - II
- Class 11: Themes in World History
- Class 12: Themes in Indian History - I, II, and III


- Class 6: The Earth Our Habitat
- Class 7: Our Environment
- Class 8: Resource and Development
- Class 9: Contemporary India - I
- Class 10: Contemporary India - II
- Class 11: Fundamentals of Physical Geography, India - Physical Environment
- Class 12: Fundamentals of Human Geography, India - People and Economy


- Class 9: Democratic Politics - I
- Class 10: Democratic Politics - II
- Class 11: Political Theory
- Class 12: Contemporary World Politics


- Class 9: Economics
- Class 10: Understanding Economic Development
- Class 11: Indian Economic Development
- Class 12: Introductory Macroeconomics, Introductory Microeconomics


- Class 6: Science
- Class 7: Science
- Class 8: Science
- Class 9: Science
- Class 10: Science


- Class 12: Biology - Last four chapters


- Class 11: An Introduction to Indian Art


- Class 11: Sociology - Understanding Society
- Class 12: Psychology - Introduction to Psychology

It is important to note that while NCERT books provide a strong foundation, they might not cover the entire UPSC syllabus comprehensively. Therefore, it is advisable to supplement your preparation with additional reference books and current affairs materials. Additionally, practicing previous year question papers and taking mock tests will help in assessing your preparation and improving your performance in the UPSC exam.