sir, I'm interested in NDA FOR INDIAN AIRFORCE.
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Hope you are doing good.
So as per your query, in order to join in the NDA exam, one must complete their intermediate course. After the completion of the course you can apply for the exam of NDA. in order to apply for the exam go to the official site of the UPSC and apply from the site. Because UPSC is the official authority which is conducting the exam.
After application, the Exam is generally conducted in 2 phases and you can apply for both of them. After completion of the exam admit cards will be released and basing upon the merit you will be able to get the seat.
The syllabus for the exam is as follows:
2. Quantitative Aptitude
5. General science
8. Current affairs etc.,.
Hope it helps you!!