Hi, there are various ways you can join IAF like appearing in CDSE, NDA, AFCAT, EKT Examinations. Followed by SSB interview and medical and all india merit list examinations.
You can apply for AFCAT examination else you can apply for CDSE examination.
Give written examination, once you qualify .
You will be called for SSB Interview
Once you qualify SSB, you have to undergo medical examination.
There will be final merit list. If you are lucky you will find your name there.
Then you will be unlucky once you undergo rigorous training.
Again you become lucky once you join your unit.
Best of Luck