hello, good hold on your language is very important in order  to clear any competitive exam, especially CLAT. You can do this by studying from vocabulary books. Here are some of the best vocabulary books available for clat aspirants ;

• The Vocabulary Builder Workbook by Chris Lele
• Word Power Made Easy by Norman Lewis
• The Black Book of English Vocabulary by Nikhil Gupta
• Oxford Learner's Pocket Word Skills by Redman Stuart