Hey there
As such there is no minimum percentage required in NDA but almost every candidate who cracks the exam has good percentage in 12th. You should not get worry about the percentage in 12th one should pass 12th with physics and mathematics.
Check about eligibility criteria of NDA
https://www.google.com/url?sa=t&source=web&rct=j&url=https://competition.careers360.com/articles/nda-eligibility-criteria/amp&ved=2ahUKEwiu1LzKq5bjAhXPfH0KHcLxDWoQFjAAegQIBxAD&usg=AOvVaw1I0C9hFQPh7j-5oJDaK70E&cf=1&cshid=1562074356295
Good luck
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