I will become an i.a.s. now i am studying b.sc. computer science so this time onwords i want to prepare for i.a.s exam. so which books are need to me

First of all I want to ask you in which year your are studying bsc computer science. If final year it may be a good decision to prepared for IAS/CAT exam. You may refer TIME Coaching Institute, RAU's IAS Study circle. They will guide as well as provide you the study material for preparation. You can