I have completed 12th with 76% marks. Am I eligible to join Indian Airforce or not?

Sorry, with the qualification of 12th pass, you are not eligible to join Indian Airforce.

The minimum eligibility condition required to join Indian Airforce is graduation.

Indian Airforce organizes AFCAT written exam for following posts:
Technical branch
Flying branch
Ground duty branch

Aspirants must have obtained 60% marks in graduation.

For the Administrative & Logistics division candidates must have obtained Graduation with 60% aggregate marks or Post Graduation/ equivalent with 50% aggregate in any discipline required.

For Accounts department aspirants must have obtained B. Com with 50% minimum aggregate or M. Com/ CA/ ICWA with minimum 50% aggregate marks in all subjects required.

For Education branch applicants must have obtained degree in Post graduation Degree with minimum 50% marks aggregated for all papers is required.