Most defence academies are owned and established by retired Army Officers and other Military Personnel. Therefore, most of them are really good and have a great success rate. Here in Rajsthan, there's a Defence Academy which goes by the name Rajasthan Defence Academy is one of the best academies all over India. The facilities there are perfect to get trained (physically, mentally & emotionally) for exams like NDA, CDS, SSB, Airforce, Naval, Paramilitary Forces and various other exams. If you are a guardian or an aspirant, you can check out their website for more information.