Hello Aspirant

Yes, you can give  NDA exam  even after completing your class 12 with commerce without Mathematics but there is a condition you can only apply for army wing of the NDA and not the Airforce or navy because Maths is compulsory for these two.

You will also have to give NDA exam which contains maths syllabus of both class 11 and 12 so this can be a hurdle for your preparation  so prepare for it wisely.

Hope this helps.