Hi Sachin,

As per the latest NDA Eligibility Criteria, the student should be of 16.5 years - 19.5 years at time of giving the entrance exam. Now, on 6 June 2023, you will be of 18 years of age. Now, you have one attempt for NDA 1 and one for NDA 2. In total, you have 2 attempts for NDA examination.

Refer here for more info - UPSC NDA Eligibility Criteria 2021 - Age Limit, Marks, Qualification, Nationality (careers360.com)

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!