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To apply for National Defence Academy Entrance Examination you must have passed 10+2 examination from a recognized board. If you have passed 10+2 with Mathematics, Physics and Chemistry you will be eligible to apply for Indian Naval Academy, Air Force Academy and Indian Military. If you have  passed 10+2 with any other subjects then you are eligible to apply for Indian Military Academy. Candidates who are appearing in 10+2 examination are also eligible to apply for NDA provisionally. Such candidates must obtain the passing certificate before the cut off date specified. The age of the candidate must be 16.5 to 19.5 years at the time of commencement of the course.
As you will pass 10+2 in the year 2024 you will be eligible to apply for NDA 1 2024 and NDA 2 2024. The date of birth criteria to be eligible for NDA 1 2024 is that a candidate must not be born earlier than July 2, 2005 and not later than July 1, 2008. The date of birth criteria to be eligible for NDA 1 2024 is that a candidate must not be born earlier than January 2, 2006 and not later than January 1, 2009. You are not eligible to apply for NDA 1 2025 because the candidate applying must not be born earlier than July 2, 2006 and not later than July 1, 2009.