it took a long time to search the right content on web, now I got different link so that one can easily prepare for GATE exam. the links are provided below

http://www.iqmantra.com/
http://electronview.com/
http://targate.dabanggengineers.com/

you can also find some govt jobs here

 http://www.allgovtjobs.in/2012/09/bel-recruitment-2013-probationary-engineer-through-gate-2013.html
below is a good site for programming reference:
http://www.candcpp.com/