Hi,

The syllabus for UPSC DCIO exam is-

1. Electronic Devices and Circuits

2. Signals and Systems

3. Digital Electronics

4. Computer Organisation and Operating Systems

5. Analog Communications

6. Digital Communications

7. Microprocessors and Microcontrollers

8. Digital Signal Processing

9. Computer Networks and Cyber Security

10. Microwave Engineering

11. Satellite Communications

12. Wireless Communications and Networks

13. Radar Systems

14. Artificial Intelligence

15. Internet of Things

You can study these subjects from the books you have studied in your engineering course.

Thank you.