Hi pratham
Let me first tell you that a commerce student can apply for NDA but he should have maths as one of his core subject.
So, if you don't have maths then you can't apply for nda since nda consists of two papers.
Paper 1 is mathematics and paper 2 is gen. Science (including chem, physics,gk, reasoning).
Also for airforce , physics is compulsory thus commerce students are not eligible for airforce .
But  can give NDA with army and navy as there preference.
You can Give CDS exam after graduation since it has only general Knowledge and english.
It's just like nda but is taken after graduation.

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