Hey Jignesh ,
The selection procedure for AFA , Dundigal through combined defence services examination  is as follows
1.applying for the written exam after fulfilling the eligibility criteria
2.after clearing the written , comes the dates for service selection board
3. On clearing the test in service selection board this shall also include PABT if you are opting to be a flying cadet , now the candidate has to go through a series of Medical checkup , if the candidate is declared fit by the medical board , results in his final selection
4.now all the candidate has to do is to wait for the merit list , if he makes the cut , then he shall receive call letter for the academy
Hope this helps