Hi there,
The age limit for bmm is 22 years for general category and 24 years for reserved category..
Yes you can do bmm after mbbs if your age is under 22, but there is no sense in this as both are bachelor's degree and why you want to do two bachelor's degree, either do md or ms after mbbs or anything else after bmm.
Trt to figure out your ambition and then take the decision.
I hope this helps
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