Hello

Some of the books which you can refer for preparation of the CAT exam are:

Best Books for quantitative ability
NCERT books from class 6th to 10th
Quantitative Aptitude for CAT by Nishit Saxena
Quantitative Aptitude Quantum CAT by Sarvesh Sharma
How to Prepare for Quantitative Aptitude for the CAT by Arun Sharma
Quantitative Aptitude for Competitive Examinations by Abhijit Guha


Best Books for Verbal Ability and Reading Comprehension
High School Grammar and Composition by Wren and Martin
Word Power Made Easy by Norman Lewis
How to Prepare for Verbal Ability and Reading Comprehension for the CAT by Arun Sharma and Meenakshi Upadhyay
Verbal Ability and Reading Comprehension For The CAT by Nishit Sinha

Refer to the link below for details about the other books-

https://bschool.careers360.com/articles/best-books-for-cat-preparation

Also, to practice CAT mock tests, go through the link below

https://learn.careers360.com/test-series-cl-cat-2019/

https://learn.careers360.com/test-series-cl-cat-full-2019/

Good Luck!