Hey.

GK -  For current affairs, first of all develop a habit to read newspapers daily. The Hindu is the newspaper preferred by various law Aspirants. You can also practice using Universal's guide to CLAT and other law entrances for static gk.

English - For Vocabulary you can refer the Word Power Made Easy. You will come across various words while reading the newspaper too, prepare a list, go through them regularly and try to use them in sentences.

For grammar you can use the Wren & Martin.

Legal Aptitude and Reasoning - Universal’s guide to CLAT and LLB, Pearson CLAT Guide are considered the best for law entrances

Make sure that you go through the past year question papers and practice them along with sample papers.

Best of luck!