Hii aspirants

let me clear your doubt.

the process for applying nda exam is-

The application forms for NDA 2019 is available online on the official website of UPSC (www.upsconline.nic.in). Registration Procedure comprises of two steps, first, fill the application form as per the given instructions, and, second, remit the application fee of INR 100, either by online or offline mode.

for more detail you can  visit the site

https://competition.careers360.com/exams/nda

I hope my answer will be helpful for you Good luck