There is no percentage criteria for NDA aspirants. You can definitely appear for NDA exam. Those who want to apply for Indian Air Force or Indian Navy must have physics and mathematics as their subject in 10+2. All the best!
NDA is the National Defence Academy is the very good path to enter in the defence directly for the post of an officer. Those students who have passed there 12th class with more then 60% marks are eligible to apply for the NDA exam. There are any proper streams required but you have studied math as the main subject in your 12th class.