hello aspirant,

According to the Eligibility criteria for the NDA (National Defense Academy), you must have to pass class 12th with Physics, chemistry, and mathematics as the mains subjects. So, if you have mathematics as the Optional subject in class 12th then you are not eligible for NAVY.

However, You are eligible for Army Wing.

The Eligibility criteria for NDA Examination for Navy is as follows :

For technical branches-

10+2 PCM: Min aggregate:60-70%

English- 50-60%

For non-technical branches-

10+2 any stream:

Min aggregate: 60%

English - 50-60%

Further, to know more complete details on how to become Navy Officer, you can follow the below mentioned link to know more : https://www.careers360.com/careers/articles/how-to-join-indian-navy-after-12th-counar

I hope that this will help.