Hello
gauravkumar79821 ,From some research on internet I found that the upcoming exam of NDA will be in December- January  which is named by (NDA-I) and after that the second chance will be in coming june-july which is named by (NDA-II).

Hope it will be helpful for you :)

Hello Gaurav,

NDA 2021 will be held in April 2021 and in September 2021 (tentatively). National Defence Academy Exam 2021 is a national level exam organized by UPSC (Union Public Service Commission) to recruit candidates in Army, Navy, and Air Force. It is conducted twice every year as NDA (1) and NDA (2). Qualified candidates are sent for training at NDA, Khadakwasla and once they graduate from NDA, they are sent to the respective specialized academies of the three forces, namely, Indian Military Academy (IMA), Indian Naval Academy(INA) and the Air Force Academy(AFA).

Eligibility for NDA 2021:

Educational qualification: It is different for different academies. Therefore, the aspirants should check the educational qualification

Navy, Air Force, and Naval Academy of NDA: The aspirants should qualify their class 12 or HSC exam under 10+2 exam pattern, which should be conducted by the State Education Board or University.

Know more about the application form of NDA 2021, like steps to fill, eligibility criteria in this article

https://competition.careers360.com/articles/nda-exam-dates