See the upper age limit for the AIRFORCE X group is 21 years. So technically you have 2 attempts left.

For the Group X Technical trades one require a 10+2 with PCM or a Diploma in Engineering from a recognised institute.

To know more about the INDIAN AIRFORCE AIRMAN visit the link below:

https://www.careers360.com/careers/indian-airforce-airman

I hope this answer helps. All the very best for your future endeavors!