Hello Shyam,
Yes, definately you can apply for NDA Exam with 40 marks in Maths at 10+2.
Eligibility criteria for NDA is candidate must have paseed 10+2 from
any recognized board but for Air Force and Naval of NDA candidate
should have Physics and maths in 10+2.
You can also visit the careers360 regarding it ,link is given below-
https://competition.careers360.com/exams/nda
Thank You.
Hope it was Helpful.
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