Dear Venkatesh, technically based on your Bachelor's degree, you can apply for an entrance examination and if you qualify, you can join LLB. But if your MBA is a full time course, then you would have submitted your original Graduation certificates in your College/University. And if you qualify fpr LLB, during counselling and admission, you will have to show them your Original Documents and submit them.in your LKB college. That becomes an issue there.

Hello there. 

The eligibility for 3 year LLB courses in different Indian Universities is to have a graduation degree in any stream from any recognized University with at least 50% in your graduation.

The score differs according to the University you are applying into. Some ask for 45% in graduation and some mention 50%.

Hence, irrespective of your MBA degree you'll be eligible for 3 year LLB courses.

For your further reference I'm attaching the link for DU LLB and MHCET law examinations:

https://law.careers360.com/exams/du-llb

https://www.google.com/amp/s/law.careers360.com/articles/mh-cet-law/amp

Hope this helps.

All the best.