Hey Seema.

There are 2 types of Law courses in India- 3 year LLB course and 5 year integrated law course. 3 year law courses are for those who have completed their Undergraduation. So after completion of any 3 years of Undergraduate  course, you can do LLB which will be for 3 years. Hence It would take 6 years if you start witha separate UG degree.

And in 5 year law course are for those who are seeking to puruse law after class 12th. It combines an Undergraduate degree with law, for example- BA LLb, BCOM LLb, BBA LLb etc. It takes 5 years after 12th class.

Best of luck