Dear Aspirant !

Hope you are doing great ! However it is not necessarily to take drop after 12 because a lot of students prepare for nda in their class 12 but as we know there is everything in India so you can take drop also as many students do.but I think 4 or 5 months are more than enough to prepare for it .

Hopefully it helps you !!

Thank you

See the age limit for the NDA is in the range  16.5 to 19.5 years. Now in general the students may take drop but you must be sure that your age must include in the range by the time you appear. It is always better to prepare while studying and practice seriously along side of your board. This is the most optimal way you can go and many students crack the examination in this way as well.

To know more about the NDA 2022 visit the link below:

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

I hope this answer helps. All the very best for your future endeavors!