You want not to buy every one of the books prescribed to you.

You ought to comprehend that anything you want to learn for the UPSC test, you can help it through a few solid assets. So there is a compelling reason need to peruse many books. Your IAS concentration on material ought to be a savvy blend of course readings, NCERT books, online sources, paper notes, magazines, and so on.

BOOKS FOR IAS PRELIMS CSAT PAPER II

Tata McGraw Hill CSAT Manual

CSAT II - Arihant

Verbal and Non-Verbal Reasoning - R S Aggarwal (For the understanding entry part)