My questionis after12Coursein Nda course

Hii Rutwik!
Although your question is not clear, I will attempt to answer it on the basis of NDA course. To join NDA after class 12th you need to go through the NDA entrance examination. The syllabus consists of class 11th and 12th chapters. The eligibility criteria states, the age should be from 16 - 19 years of age. You will get full details on NDA and the application form in the links given below-
https://www.google.com/amp/s/www.careers360.com/question-how-to-join-nda-after-12-which-document-are-required-for-the-feeling-online-form

https://www.google.com/amp/s/competition.careers360.com/articles/nda-application-form
Hope this helps.
Good luck!