Electrical Machine : P.S. BHIMBRA B.L. THEREJA(1 phase machines) Power Electronics : P.S. BHIMBRA M.H. RASHID Analog Electronics : J.B. GUPTA MILLMAN AND HALKIAS MALVINO Digital Electronics: MORRIS MANO A ANAND KUMAR Power System : J.B. GUPTA NAGRATH KOTHARI Control System : HASAN SAEED B.S. MANKE JAIRATH (CBS PUBLISHER){Must for practice} Signals & Systems : OPPENHEIM TARUN KUMAR RAWAT Microprocessor : GAONKAR B. RAM Mathematics : B.S. GREWAL ERWIN KREYSIG MADE EASY PUBLICATION Measurements : A.K. SAWHNEY General Aptitude : Buy any good aptitude book from the market like R.S. Aggarwal Apart from studying these books one must practice a lot and should attend a number of mock tests to score good in GATE. Practice is a must.