Hello aspirant,

Every year, UPSC conducts two NDA exams. The test is taken to gain entry into the esteemed NDA for members of the Army, Navy, and Air Forces.
You are not eligible to take the NDA exam after taking basic math in your tenth grade year. You must have taken math and physics in your eleventh and twelfth grades in order to sit for the NDA exam.

Thank you

Hope it helps you