dear prathyusha usha
you can download gate books for ece in pdf given below
http://www.mygatebook.com/2016/05/gate-ece-notes-material-free-download.html?m=1
Or else you can buy from amazon store all books are nice to study
all the best
I would suggest you to go through with the given below link to check the ECE books for GATE.
Good luck!
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