Hey.

If you have already pursued graduation and then want to pursue law, you will have to go for a 3 year LLb degree. Various top colleges offer this course and the mode of admission in each is different. Having a minimum aggregate of 45%-50% marks in your graduation would be required to be eligible for admission here. It varies according to colleges. Here is a list of law entrances for 3 year LLB course -  

DU LLB - Delhi University  

MH CET- GLC mumbai, ILS Pune and other colleges in Maharashtra  

SLAT- Symbiosis Law school  

PU LLB- Panjab University, Chandigarh    

LSAT- Jindal global Law school, IIT Kharagpur and other private law colleges

BHU LLB- Banaras Hindu University

  BVP LLB- Bharatiya Vidyapeeth

TS LAWCET Etc

Best of luck!