Hello,

Yes, you can add Mathematics through NIOS (open board) and then apply for the Indian Air Force Flying Branch .

For the Flying Branch, Physics and Mathematics are compulsory subjects at the 10+2 level. Since you passed 12th with PCB, you can take Mathematics as an additional subject from NIOS.

You will then have two marksheets :

1. Your first 12th marksheet (with PCB)

2. Your NIOS marksheet (with Mathematics)

This is completely acceptable , as long as both marksheets are from recognized boards (and NIOS is a valid board).

When you apply for the Air Force, you will need to submit both marksheets to show that you have studied Physics and Mathematics at the 10+2 level.

Hope it helps !