Dear Student,

For AFCAT there is officially mentioned that you need to complete your graduation from any recognized board with maths and physics as a compulsory subject. When you will fill the application form they they will ask you to submit the pdf copy of your marksheet for the proof, and there is only one tab where you have to submit that, so even if you complete your maths degree from a open source also then you will not able to submit the proof of that degree. Everything they are asking need to be mention in a single degree.

Best Of Luck!!!