Hi,

You can go for NDA even in first year of engineering college as for NDA Exam, you need to be 12 passed. You can sit for the exam until or unless you meet all the criteria mentioned below:

• For NDA I , your DOB must be between July 2, 2002- July 1, 2005.
• For NDA II, your DOB must be between January 2, 2003-January 1, 2006
• You must be unmarried.
• Candidate must be of Indian National/Subject of Nepal, Bhutan, Tibetan Refugee/Indian Origin person
• Candidates need to have pass class 12 in any stream for Army, Physics and Mathematics is essential for Air Force and Navy.

If you meet these criteria, you can go for UPSC NDA Exam.

For detailed eligibility criteria, you can refer over the following link: https://competition.careers360.com/articles/nda-eligibility-criteria