Hey Nandini.
Various entrance examination for five year integrated courses do not have any age limit for applying. So you will be eligible to take admission in a 5 year Integrated course as your marks in Class 12th will be considered for eligibility criteria. But as you have already competed a graduation degree then I would suggest you to go for a 3 year LLB degree only. Doing a 5 year law degree will take you 2 years extra and you'll have to do undergraduate degree again. There are various Law colleges where the minimum aggregate required in graduation is less than 50%. Various colleges require a minimum aggregate of 45% marks too like colleges under MHCET. So you can try for such colleges instead. Otherwise you'll be eligible for 5 year law courses too.
Best of luck