hi,

see after completing mbbs course you can join indian army as a doctor,

there is recruitment comes from permanent service and short service commission, which you need to apply once you have completed your mbbs course, you may join in Armed Forces Medical Services as a Doctor by clearing your interview, which is taken by Army Doctors.

other way to join indian army as a doctor is you need to do MD/MS from AFMS institutes where 50% of candidates have got recruitment in indian army doctor position.