Dear aspirant

Educational qualification for NDA candidates are they should be 12th class passed. You can check the below mentioned point for better understanding

•Minimum education qualification required for NDA is 10+2 (Army), 10+2 with Physics and Maths (Air Force & Navy)

•Aspirants appearing in Class 12th or equivalent examination are eligible to apply

•Aspirants who are appearing in the 11th class exam are not eligible for this examination.

So suppose that if you are appearing for your 12th class exam in March2021 then you will be eligible be for applying registration form both April 2021 and sept2021.

Hope I may have resolved your query

All the best !!