Hello Raghu,
If you want to do MBA in HR, you can go ahead with it. You can have a bachelor’s degree from any stream with the required minimum percentage. The minimum percentage is usually 50%. You will need to give CAT/MAT exams. Once you clear the exams and get the adequate marks, you will be called for a GD and a PI round, which is the final phase of the selection phase.

I hope this was helpful and all the best!