Hii

To get eligible for NDA, you weight should be 56 Weight (in kgs) if you have height of 175 & age- (16-17).

To know about NDA Eligibility Criteria 2018 For Army Wing of National Defence Academy & For Air Force and Naval Wings of National Defence Academy and for the 10+2 Cadet Entry Scheme at the Indian Naval Academy, Click below link-

https://competition.careers360.com/articles/nda-eligibility-criteria

All the best.