Yes, for doing 3 year LLB the minimum eligility criteria is :you need to have a graduation degree issued by any university or college recognised by UGC and following a 10+2+3 education pattern with at least 45 per cent in the aggregate of the subjects, and 40 per cent for those belonging to SC/ST categories and in few entrance exam they require at least 50 percent (45% marks for OBC category and 40% marks for SC/ST category) marks in aggregate of the subjects.

Hence, you may do LLB after graduation.

For DU. LLB :https://law.careers360.com/articles/du-llb

for MH CET 2019: https://law.careers360.com/articles/mh-cet-law

if you want to know about any other 3 year course, please ask