here i am telling you basic education qualification required for all the courses
1. for indian military academy (IMA) only a degree or equivalent required of a recognized university.
2. indian naval academy (NA) - degree in engineering from a recognized university/institutions
3. air force academy (AFA) - degree of a recognized university (with physics and mathematics at 10+2 level) or bachelor of engineering
4. officer's training academy (OTA men) - degree of a recognized university or equivalent
5. officers training academy (OTA - women , non-technical) - degree of a recognized university or equivalent
for more details kindly through the link mentioned below
hope this helps!