Dear Sumit, considering the fact that you did your M.Sc Mathematics, you must have done your 10+2 in Physics, Chemistry and Mathematics. If it is yes, then you can study Biology as an additional subject and then appear for NEET. NEET allows you to study courses like MBBS, BDS, Ayush, Veterinary Courses, BPT, BOT, etc. That covers major Medical courses. But if you have studied Biology as a subject in your 10+2, then you can still appear for NEET. Now NEET has no upper age limit and no cap on no.of attempts. So it will work in your favour.