you are not eligible to apply for Air force examination after completing 12th examination because after completing 12th examination unmarried male candidates are eligible and female candidates are not eligible to apply for this examination.
If want to join in Air force course,then you have to completed your graduate degree in any discipline and then you are eligible to apply for this examination.So,as you are qualification you are not eligible to apply for this examination.
Indian Air force in NDA :-
The candidate should have passed intermediate with physics and mathematics from a recognized School or equivalent qualification and candidates who are pursing in the final year of 12th or appeared 12th examination may also eligible to apply for this examination.
The candidate should have a minimum 16.5 years and 19 years (i.e candidate born not earlier than 1st January 1994 and not later than 2nd July 1996) are eligible to apply fore this examination.The candidate who are crossed 19 years are not eligible to apply for this examination.
here you did not mention your Education Qualifications
So If you mentioned Education Qualification it is Very Good
Do not worry i will help you each and every Thing
First should check the weather you have following are Education Qualification having or Not
There are three Exams are there
NDA-National Defence Academy
CDS-Combined Defence Service
AFCAT-Air force Common Admission Test
For NDA Exam Education Qualification are Should be completed 12th or Equivalent Education from Discipline Board and age should be between 16.5-19 years
For CDS Exam Means Combined Defence Service this Exam Needs Graduation from Any Discipline University and age should be between 19-23 Years
These two Exams are conducting by Union Public Service commission two times in a Every Years
AFCAT-Air force common Admission Test
This Exam Includes Three Branches
Technical Branch:Should be completed Engineering Graduation with 60% Marks and age should be between 21-27 Years
Flying Branch:For Flying Branch should be completed Graduation from Discipline University and with 60% Marks and age should be between 20-25 Years