You can join Indian Airforce flying branch by giving CDS exam. Combined Defence Service Examination (CDSE), conducted by UPSC twice every year

Tentative Schedule: (Examination held twice a year)

Notification of Examination August and March
Conduct of Examination February and August

Age-limits:
19-24 Years Indian Military Academy
19-23 Years Air Force Academy
19-25 Years Officers’ Training Academy
19-22 Years Naval Academy

Educational Qualifications:

IMA & OTA
Must have passed degree of a recognized University or equivalent

Naval Academy
Must have passed B.Sc. with Physics & Mathematics or Bachelor of Engg

Air Force Academy
Must hold B.Sc. with Physics and/or Mathematics or Bachelor of Engg