Preparatory book for MBA/MCA/CAT/MAT/NMAT/GMAT/SNAP.

Hi friends,
I am at the end of my last semester in BCA and now for higher studies I want to give competeive exams for both MBA and MCA. I need the guidende for the selection of best preparatory book for the purpose So, can prepare for the exams like CAT/MAT/SNAP/GMAT/JMAT/NMAT etc.
Please help me and suggest me some books for the purpose.

There are many book available in the market for the preparation of these exam. The basic standard of examination is same in all these examination. I think R S Agarwaal is the best book to prepare for these competitive exams.