Hello Aspirant,

Yes, you can join Indian Air force's ground duty branch, however you can't do it directly after your 12th standard, you need to have a graduation degree from a recognised University and you can appear for AFCAT exam in the final year of your graduation or after it. After clearing written exams for AFCAT one needs to go through SSB interview, medical tests and training in order to make it to IAF ground duty branch.

Hope this helps!