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Overall 70% is class 12th and 30% is class 11th so by studying class 12th only one can clear NDA examination but if you have sufficient time then be on safer side and study class 11th portion also.
The min. percentage to join NDA is 55% in class 12%. To join army you can have any of the 3 streams but with MATHS.
For more information visit the link given below
https://www.careers360.com/question-how-many-syllabus-are-reletated-to-nda-of-11-and-12-class

National Defence Academy & Naval Academy Examination

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