Hello Aspirant,

Hope you are doing well

To become a officer in IAF there are many ways right after 12th and graduation After passing 12th you can appear for UPSC NDA/NA exam conducted  by UPSC twice a year but for IAF you must have Physics & Mathematics as one of the subjects.You can get the detailed notification about it from official website of UPSC.

After Graduation there are many ways you can become officer in IAF

1. UPSC CDS conducted by UPSC twice a year like NDA for this you must have studied Physics & Mathmatics and Graduation Degree in any stream is applicable.
2. AFCAT (Air Force Common Admission Tes) conducted by AIR FORCE it self with the help of C-DAC for this your eduactional qualification should be 12th with Physics & MAthesmatics with 50% in ecah yes here is percentage bar and Graduation in any stream with atlest 60%.

Hope It Will Be Helpful to you,

Thank You.