Hello Ramandeep,
General Knowledge and Current Affairs. For this entrance focus more on Static GK than on Current affairs. If you look at the previous year question papers then you will be repeating questions too. There are morrestatic GK questions. For that you can use the Consized sized Pearson or Lucents book. Try solving previous year papers too.
For preparation you can use An All Inclusive guide like Univeral's guide to CLAT and LLB. This book would be sufficient for preparation. Make sure you pay attention to the General knowledge section than other sections as the weightage is the most.