NDA

Hi
You have to clear 12th class first then you will be eligible.

Hi
For NDA, maths is compulsory in 12th. Please go through the notification provided on the UPSC website to know more. If you are really passionate about NDA then you can also consider it after UG through CDS/AFCAT and a slightly different line CAPF. You can also see this link:
https://www.shiksha.com/exams/nda-exam-results

Hi
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SSB NDA Coaching Institute : Kargil Defence Academy
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Academy, Navy, AFCAT SSB And CDS Coaching Institute.

Yes, you can apply for both exams.

Hi
AFCAT eligibility
Education : Graduation (min 3 years) in any discipline with min 60% marks and have passed Maths and Physics as subject at 10+2 level B.E/ B.Tech from a recognised University with min 60% marks. Age Limit : 20 to 24 years.

Hi Shivam
For NDA (1) 2020: The candidates possessing age between 2nd July 2001 to 1st July 2004 are eligible for the examination. If born before 2nd July 2001 and after 1st July 2004 then not eligible for NDA (1) 2020 exam. Only unmarried male candidates are eligible for NDA examination.

Yes, he can apply for the exam.
For NDA (1) 2020: The candidates possessing age between 2nd July 2001 to 1st July 2004 are eligible for the examination. If born before 2nd July 2001 and after 1st July 2004 then not eligible for NDA (1) 2020 exam. Only unmarried male candidates are eligible for NDA examination.

Minimum 60% is needed in 12th standard.