UPSC EPFO Syllabus General Science & Knowledge of Computer Applications 

• Physics
• S.I. units,
• Motion,
• Sound,
• Light,
• Wave
• Energy
• Electricity

Chemistry

• Chemical Properties of Substance and their uses,
• Chemical Name of Important substances 
• Properties of Gases
• Physical Change and Chemical Change
• Surface Chemistry
• Chemistry in Everyday Life

Biology

• Facts about human body parts
• Nutrition in Animals and Plants,
• Diseases and their causes 
• Life Science

Computer Applications

• Operating Systems
• DBMS, Data Structure
• Computer Network
• Input/Output Devices
• Computer Organizations 
• Internet
• MS Office

The UPSC EPFO exam covers a general knowledge of science and computer applications. Here are some recommended books to help you prepare for this section of the exam:

Science

Encyclopedia for General Science by Arihant Publications

• This book covers a wide range of scientific topics, including physics, chemistry, biology, and earth science. It is a good resource for brushing up on your basic scientific knowledge.

NCERT Science textbooks (Class XI and XII)

• These textbooks are a great way to learn the fundamentals of science. They are written in a clear and concise way, and they cover all of the important topics that are likely to be tested on the UPSC EPFO exam.

Handbook of Computer Science and IT by Arihant Publications

• This book covers a wide range of computer science topics, including hardware, software, networking, and the internet. It is a good resource for learning the basics of how computers work and how they are used in today's world.

Computer Awareness by Arihant Publications

• This book is specifically designed to help candidates prepare for the computer awareness section of the UPSC EPFO exam. It covers a wide range of topics, including computer basics, operating systems, MS Office, and the internet.

These are just a few of the many books that can help you prepare for the science and computer applications section of the UPSC EPFO exam. The best book for you will depend on your individual learning style and needs.

Additional Tips
It is important to practice answering practice questions. This will help you get familiar with the format of the exam and identify any areas where you need to improve your knowledge.