Hello aspirant,

Hope you doing well

NDA eligibility criteria 2023 is depends on various factors like age, educational qualification, physical standard, nationality, etc.

Age limit - 16.5 to 19.5 years

Educational Qualification - Passed 12th standard with maths and physics

Number of attempts- No limit but you must be appear NDA exam in above age group only

Below link is of NDA 2022 but you get some idea about NDA exam of 2023

https://competition.careers360.com/articles/nda-eligibility-criteria

Hope this helps you