Hello,

Written Examination will be conducted by UPSC on 18th April 2021 for admission to the Army, Navy and Air Force wings of the NDA for the 147th Course, and for the 109th Indian Naval Academy Course.

The naval wing and air wing requires maths and physics as a compulsory subject.

Candidates who are appearing in Class 12 or equivalent examination can apply.

As you want to give exam in the naval you are not eligible for it without maths.

https://www.joinindiannavy.gov.in/en/page/selection-procedure.html

You can refer to this link for more information

Hope this helps!!