Hey Sandeep.

LLM is masters in Law. Hence in order to pursue this course in India the minimum eligibility criteria is that you need to have completed a law course- 3 year or 5 year from any institute which is recognised by the Bar council of India. As you've mentioned that you  are an MBA graduate, you will not be eligible for LLM until you've done law.

If you've completed your bachelor's degree in Law then there are various entrances for LLM- CLAT, AILET, DULLM, ILICAT, PUCET, IPUCET etc.

Best of luck