Dear friend ,
Following are the best book for you.you must solve maximum number of  sample papers daily .Try to solve maximum questions. This may help u in getting good marks.

How to prepare for Quantitative Aptitude for the CAT Editor: Arun Sharma
Quantitative Aptitude for Competitive Examinations Editor: Abhijit Guha
The Pearson and Guide to Verbal Ability and Logical Reasoning for the CAT
Editor: Nishit K. Sinha
TOMATO (Test Of Mathematics at Ten plus Two level published by ISI)How to Prepare for Verbal Ability and Reading Comprehension for CAT by Arun Sharma and Meenakshi Upadhyay,
Mc Graw HillQuantitative Aptitude for MBA Entrance Examinations
Editor: R.S. Aggarwal
Good luck !!!