Dear Shiv Pratap,
Some of the top books for CAT preparation include ‘How to prepare for Quantitative Aptitude for the CAT’ by Arun Sharma, ‘The Pearson Guide to Quantitative Aptitude for the CAT’ by Nishit Sinha, ‘Quantitative Aptitude Quantum CAT’ by Sarvesh Verma to name a few. Other than that, read newspapers and magazines daily to get a grip on your language and comprehension skills along with brushing up General Knowledge. Arvind Menon , another CAT 100 percentiler shares that he had referred to CAT preparation books by Arun Sharma and Nishit Sinha. More information on this topic is available @ CAT 2018: When and how to start preparations.

I hope it helps.