what position would a commerce student without math would get in army administration
Hello Avdhoot!
As you do not have mathematics along with 12th commerce, it may be problematic for you to attend the Maths section in NDA (300 marks). However, you can take coaching classes for the maths section and also work hard for other subjects like Physics, Chemistry, Hisory , Geography , Current Affairs , General Knowledge and Political science. Sometimes, additional requirements for prospective air force and naval cadets include coursework in physics and math. So, you would not get naval and air force without maths through NDA, but can opt for Army wing .
If you do not qualify NDA, there is another way too. After your graduation, you can sit for UPSC CDS exam, AFCAT or SSB. After clearing CDS exam, you can opt for OTA(Officer Training Programme) of Indian Army.
Hope you are clear.