I think you are confused with the NDA I and NDA II.
National Defence Academy (NDA) examination is administered by Union Public Service Commission (UPSC). The NDA exam is conducted offline twice an year, each for 900 marks consists majorily of two papers - General Ability and Mathematics.
It is not necessary to give both of these. The second one is just to improve your performance. If you are selected with the first exam, it is fine to not give it again.

National Defence Academy & Naval Academy Examination

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