hi,

Best books for clat on english language is as follows:

English is Easy by Chetananand Singh

Barron’s Pocket Guide to Vocabulary

Word Power Made Easy by Norman Lewis

Objective General English by RS Aggarwal

High School English Grammar and Composition by Wren & Martin

besides follow the last 10 years papers. besides english you have to prepare for logical reasoning, numerical and gk, topic wise weightage is as follows.

English Language    20%

Current Affairs, including General Knowledge    25%

Legal Reasoning    25%

Logical Reasoning    20%

Quantitative Techniques    10%

hope it would help.