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Hi Manasvi,
First of all, you need to understand the syllabus:
This is a useful tip for almost any exam. Understand the syllabus by going through past years papers and official guidelines. CAT can be segmented into four broad parts-
Quantitative Ability
Data Interpretation
Logical Reasoning
Verbal Ability
The concepts used in this examination are broadly of class 10 level. However, the questions are little bit tricky to solve and require good amount of logical thinking. But it can be developed by practice.
Books and material
First of all, get CAT preparation material of some good coaching institute.
For Quant, there are two good books- Arun Sharma & Sarvesh Varma. You can refer to any of these. Go for the second book only when you have finished the entire syllabus.
No special book for concepts of Data Interpretation, Logical Reasoning and Verbal Ability. You can rely on the coaching material for all the concepts and can solve all the practice questions. However, you can refer to some books on these topics only after you finish the entire syllabus.
For verbal, you also need to read Word Power made Easy by Norman Lewis. It is a very good book which helps in increasing vocabulary not by memorising stuff, but by understanding the ideas behind the words. It is distributed into 45-47 sessions meant to be read one at a time. It is a must-read book and should be completed within two months of starting your preparation.
You also need to read a few good story books as explained in the next point.
Thats it. Yes, you do not need any other book for concepts. This much is enough.