Dear student,

Yes you can apply for NDA examination. The eligibility criteria of NDA says that the students that wish to appear for the examination must have passed the class 10+2 examination. The applicants wanting to get into Indian Army should be class 12th passed with no specific subject requirement but for Indian Navy and Air Force candidates must be 12th passed with maths and physics. So since you are in medical stream you can apply for indian army.

For more info visit the following link:

https://competition.careers360.com/articles/nda-eligibility-criteria