Hello,

Eligibility recruitment for NDA is different for two different wing:

Category 1: For Army Wing of National Defence Academy :  Should have passed Class 12.

Category 2: For Air Force and Naval Wings of National Defence Academy and for the 10+2 Cadet Entry Scheme at the Indian Naval Academy: 

must have passed class 12 with Physics and Mathematics conducted by State Education Board/ University. Candidates appearing in Class 12 or equivalent examination are also eligible to apply for NDA 2019. However, those appearing/ passing class 11 exams are not eligible for the exam.

You are eligibile for 1st wing but not for the second

https://competition.careers360.com/articles/nda-eligibility-criteria