Hello aspirant,

YES, you will be eligibhle to give NDA (national defense Academy) if you have studied commerce in class 12th. Commerce students are eligible for appearing on NDA and are considered for non-technical arms of Indian Army. Every year, lots of commerce student clear NDA. Furthermore, you can only join army forces and are not eligible to take part in navy and air force.

Further, the basic eligibility criteria says that :

Nationality - Indian Age Limit - Applicants born between July 2, 2003, to July 1, 2006 are eligible. Educational Qualification - Passed 12th standard with maths and physics

Further, to know about the complete and detail eligibility criteria for NDA exam, you can follow below mentioned link to know more on this : https://competition.careers360.com/articles/nda-eligibility-criteria

I hope that this will help.