Hi Dear,

Following are top English Grammar book for understanding the concept and practice:

• Wren & Martin High School English Grammar and Composition Book
• English Usage volume 1 and volume 2 by Neetu Singh
• Practical English Usage by Michael Swan.
• Longman Student Grammar of Spoken and Written English.
• A-Z of English Grammar and Usage.
• The Blue Book of Grammar and Punctuation.

Good Luck