Hi Pavan

In order to know more on GATE pattern of papers, just go through the following link- http://www.gateprep.com/posts/show/901519/examination_pattern_info-center-graduate-aptitude-test-in-engineering-900655.htm

As far as books are concerned, following is the list of books u can refer for EE, however, it is not important to buy all of these....buy those which u feel are good for your study purpose.

For Circuits and Fields

* Network and Systems by D.Roy chowdhary
* Network Analysis VanValkenburg
* Engg Circuit Analysis Hayt & Kemmerly
* Networks by G.K.Mittal
* Networks by Heulsman
* Electric Circuits by Joseph A. Edminister

For Power Electronics

Power Electronics by P.S. BIMBHRA
Power Electronics by RASHID
Power Electronics by NED MOHAN
Power Electronics by KHANCHANDANI
Power Electronics by P.C.SEN
Power Electronics by B.K. BOSE
Power Electronics by . F.CSAKI

For Power Systems

Power Systems by J.B. GUPTA
Power Systems by ASHFAQ HUSAIN
Power Systems by SONI, GUPTA & BHATTNAGER
Power Systems by I.J. NAGRATH
Power Systems by WADHA
Power Systems by B.R. GUPTA
Power Systems by V.K. MEHETA

For Electrical Machines

Electrical Machines by P.S. BIMBHRA
Electrical Machines by J.B. GUPTA
Electrical Machines by GUPTA & SINGHAL
Electrical Machines by ASHFAQ HUSAIN
Electrical Machines by I.J. NAGRATH
Electrical Machines by CLAYTON
Electrical Machines by MUKHERJEE
Electrical Machines by B.L THEREJA ( VOL.2)

For Control systems

Control Systems by M.GOPAL
Control Systems by I.J. NAGRATH & M.GOPAL
Control Systems by B.C.KUO
Control Systems by OGATA
Control Systems by B.S. MANKE
Control Systems by SCHAUM SERIES
Control Systems by JOYARATH

For Measurements

Measurement by A.K. SAWHANY
Measurement by J.B. GUPTA

For Analog Circuits

Analog Circuits by SEDRA & SMITH
Analog Circuits by BOYLSTAD
Analog Circuits by MILMAN & HALKIAS
Analog Circuits by MILMAN & GRABEL
Analog Circuits by RASHIT & CHATTERJEE
Analog Circuits by GAYAWARE

For Digital Circuits

Digital Electronics be Morris Mano
Principles of Digital Design by John F Wakerly
Digital Circuits by Taub and Shilling
Switching and Finite Automata theory by Kohavi
Microprocessor by Ramesh Gaonker latest edition

For Signals and Systems

Signal and Systems Simon Haykin
DSP by Proakis and Manolkis
Signals and Systems by Oppenheim and Schaffer
Signals and systems by B.P.Lathi

For Engineering Mathematics

Higher Engineering Mathematics, Dr. B. S. Grewal
Discrete mathematics & its applications, Kenneth H. Rosen
Probability, Banerjee, De, Sen
Statistics and probability, N.G. Das
Linear Algebra, Hadley
Numerical Analysis & Computational procedure S.A.Mollah
Differential Equations, J. G. Chakravorty, P. R. Ghosh
Mathematical Analysis, Malik & Arora
Differential Calculus, Ghosh, Maity
Integral Calculus, Ghosh Maity
Vector Analysis, Ghosh and Maity
Complex Variables, Speigel