Hi Yashwardhan,

From your query, I believe that you are very must interested in pursuing law. To begin with, You need to start preparing for law only after class 12. To pursue law as a career there are a few options. 

1: After class 12 you could join for a five-year integrated law programme namely BA LLB, B.Com LLB and B.Sc LLB

2: You could complete your degree and then go ahead with LLB.

As far as question papers are concerned you first need to have a clarity as to which of the above options you would like to take and which entrance exam you plan to appear for. After which I can help you with the source of the question paper.