Hello Krity

There are three main branches in Indian Air Force, which candidates can join-
Flying Branch
Ground Duty Branch
Technical Branch

Eligibility criteria and age limit is different for different branches. Candidates can join Air Force Academy (AFA) after clearing CDS exam but for that age limit is 20 to 24 years.
Do let me know you want to join for which branch so we can help you accordingly.

Good Luck!