Aspirants without Maths and Physics can also apply and join the NDA, but they are restricted for joining only the Army wing, eligibility of which is, only 12th pass. The eligibility for Air Force and Navy wing, however, is Maths and Physics at the 10+2 level among others.

having an upper hand on maths will only increase your chances to join the academy. So, why take a risk and why not go that extra mile? That means you will have to work very hard and probably take some coaching to learn the mathematics of Higher Secondary level.

Therefore, to sum up, without maths, you can apply for NDA exam for Army Wing. Without maths, you are not eligible for Indian Navy and Air Force. But in any case, you have to clear the maths written exam conducted by UPSC.