You have to give GATE to go for M.Tech.

Books to be followed are:

1.NETWORK THEORY:
a.Circuit analysis by Hyat & Kemmerly
b.Network analysis by Valkenberg
2.Electronic Device: Solid State Electronic Devices by Streetman,Banerjee
3.Analog Circuits:
a.Electronic Devices and Circuit Theory by Robert Boylestad
b.Microelectronic Circuits by Sedra,Smith
4.Signal and System:
a.Signals and Sysems by Oppenheim and Willsky
5.Digital Electronics:
Digital Design by Morris Mano
6.Control system:
a.Linear Control System by BS Manke
b.Automatic Control System by Benjamin C Kuo
7.ELECTROMAGNETICS:
a.Principle of Electromagnetics by Sadiku
b.Antennas and Wave Propagation by Harish and Sachidananda
8.Communications:
a.Principles of Communication System by taub and schilling
b.Communication System by Simon Haykin
9.Microprocessor:
Microprocessor architecture, programming
And applications with 8085 by Gaonkar
10.Mathematics:
a.Higher Engineering Mathematics by B.S Grewal
b.Advanced Engineering Mathematics by Kreyszig