Where can I find books /study material for technical as well as for general studies.

Where can I find books /study material for technical as well as for general studies.
I am mechanical engineer and I want to prepare for IES-09. Which books /study material is best for technical as well as for general studies. Please guide me...

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Hi
you can go to ber sarai area near iit delhi.
this area is considered the hub of student taking tech subjects in
upsc.

Karun