Dear Deepak,
You have 2 options : either you choose to study Law after 12 th wherein it will take you 5 yrs course which will conclude as an LLB grad.Or, you study for Law after any degree & it will take you 3 yrs to complete your LLB. The minimum requiremnts in an average University /college is 45 % in 12 th.But if you plan to join NALSAR /NLSIU & other biggies in the filed then you will also be expected to give the Common Entrance.