Hey Suvankar.

The eligibility criteria for admission into any of the law colleges are different for each college and entrance exam. Most of the law colleges require that a minimum aggregate of 45-55% marks for admission in them. This is the percentage required for being eligible for admission. The admission would depend on the mode of admission for each college. Each college has a different entrance or mode of admission and the admission will be based on your score/rank in it.

Best of luck