Hi Rajat, 

You won't get a separate degree for BA and LLB. Once you are done with your BA. LLB program you will be getting one single degree which will be issued by the University. For appearing in CLAT for undergraduate program you need class 10th and 12th certificate and for appearing in CLAT for LLM a provisional marksheet is issued by the University and that is sufficient to give CLAT exam.