Hi, To prepare for CAT follow these guidelines below:

• Understand the syllabus by going through past year’s papers and official guidelines.
• If you have a lot of time, you can go for coaching. However, if you are into a hectic job and get very little time to study, you can prepare on your own without wasting that time in going to coaching. Coaching will only give you guidance. Rest depends on how sincerely you practice.
• For Quant, there are two good books- Arun Sharma & Sarvesh Varma. You can refer to any of these.
• 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.
• Subscribe to one good Test Series and write all the tests very sincerely in simulated environment. Fix a day, say Sunday, fix a time, say 9 AM, and give the test every week at the same time. Sit in proper position while attempting the test and tell all your roommates or family members not to disturb you at that time.

Good Luck!