This are some of the good books

1) Objective General English by R.S. Agarwal

2) General Knowledge by Arihant Publications

3)Quantitative Aptitude for Competitive exams by R.S. Agarwal

4)Analytical Reasoning by M.K. Pandey.

5) Study Package for CLAT and LLB by AP Bhardwaj.

Also practice previous year question papers.

All the best!