hello Aspirant

I hope you are doing good . With reference to your query , I would like to know you that you have turned into 13years on 1st july 2021. The minimum age to give nda exam is 16 years and maximum age is 19.5 years . So you will be elgible to give nda exam in 2024 attempt . In each attempt nda is held 2times ,so you will get 6attempts to crack it

Hope you found this answer helpful. Good luck for your future