If you wish to get admission in NLUs or other top law colleges then you can apply for CLAT which is a National level exam. As per the eligibility you should have minimum 45% as a General category & 40% as a reserved category. There are other university & state level exam also for which you can apply. Here I am providing you the list of top Government & private law colleges, you can go throuh with the given below link.

https://law.careers360.com/colleges/ranking