The following are the sections in CLAT exam.

The books you can refer to are:

English

• Word Power Made Easy by Normen Lewis
• Verbal and Nonverbal Reasoning by R S Aggarwal

Maths

• Quantitative Aptitude by R S Aggarwal
• Magical Book on Quicker Maths Paperback

Logical reasoning

• Analytical Reasoning by M K Pandey

GK

• Manorama Yearbook
• General Knowledge by Arihant

Refer to previous year papers besides the above reference material. You can go through Universal Guide book for law preparation (one of the famous book for law studies)

Good Luck.