As you have asked about the NDA (National Defence academy) forms, I want to tell you that UPSC has released the notification regarding it.
UPSC has announced the vacancy notice to recruit the contenders for the post of Naval Academy and National Defence Academy – Army, Navy and Air Force wings.
Candidates can apply for it from 02 Jan 2016 to 29 Jan 2016
You can apply for it by following steps given below

Go to UPSC online website, the page open look like




Then click on Online Application for various examination, the page open look like




Here you will find the link to register yourself.
Submit the application form and pay the fees and you will be able to sit in the exam.

UPSC NDA Recruitment Specification –
Name of the Post –
Naval Academy (12th Cadet Entry Scheme)
National Defence Academy
Total Number of Vacancy –
Total 375 posts are vacant in the organization.
Naval Academy (12th Cadet Entry Scheme) – 55 posts
National Defence Academy – 320 posts
Army – 208 posts
Navy – 42 posts
Air Force – 70 posts