1. Digital Electronics
2. Signal and System
3. Network Theory
4. Electromagnetic Theory
5. Control Systems
6. EDC & Analog Electronics
Op-Amps and Linear Integrated Circuits by Ramakant A. Gayakwad
7. Communication Systems
An Introduction to Analog & Digital Communications by Simon Haykins
Modern Digital and Analog Communication Systems by B. P. Lathi
8. Microprocessors
Fundamentals of Microprocessors and Microcontrollers by B. Ram