Dear Student,
You have just passed your 12th you can't do LLB now only as it is a post graduation course. For it your first have to do graduation from any stream and preferably B.A, B.com or BBA. You can also go for 5 years integrated course of B.A LLB, B.com LLB or BBA LLB. In this way you can join it just after 12th only. Hope this might help you.