The book from G.K Publication is good...
Dont read GK's book. These are full of errors and irrelevent materials.
U better read ur syllabus books n R.K.Kanodia (noida & company)
ya.. its good, u can get it on esnips freely
http://www.esnips.com/doc/4526d734-8c3e-46b7-aa8b-ac0a0869c2e4/GATE-ECE