Hey,
"The expert in anything was once a beginner."

Hello Shubham,

Understanding the importance of your question and the well-structured English Questions pro-founded in the CLAT Questioners. The Marking of English in CLAT expands on to 41 questions and              score of  40.   I suggest you refer these books to improve your English Grammar,

Raymond Murphy or Martin Hewings.

Word Power Made Easy by Norman Lewis.

Wren and Martin, High School Grammar.

Essential English Grammar with Answers.

Objective General English by SP Bakshi.

How to Prepare for Verbal Ability and Reading Comprehension for CAT.

Upkar English BSC publication English.

Universal's Guide to CLAT & LL.B. Entrance Examination can be used as a cross-refrencer as it provides all the previous year question papers and so.

The perfect understanding from these books can easily help you with working on every detail in English Grammar. The work-sheets will help you to get the timely management of answers.

Please do refer the link for more information: (https://law.careers360.com/exams/clat)

These books would serve you the best with using Grammar and hopefully you will crack CLAT soon.

Feel free to ask if you have another query.  All the best.