I am following the books of Arun Sharma. ANd I think that Quantitative Aptitude and Logical Reasoning given in it is very good. Data interpretation and verbal reasoning are not as expected.
Good study material and books plays an important role; list of top books for CAT is as follows: 1. Quantitative Aptitude for the CAT Common Admission Test by Arun Sharma for simple and easily understanding purpose 2.A Modern approach to verbal and non-verbal reasoning by R. S. Aggarwal 3.Quantitative Aptitude for the CAT Common Admission Test and Data Interpretation by Nishit Sinha for advanced purpose. 4.How to Prepare for Verbal Ability and Reading Comprehension for the CAT Common Admission Test by Meenakshi Upadhyay, Arun Sharma Some additional reading materials Refer to business magazines, Recommended Newspapers-- The Hindu,Economics Times