Hello Student
As you have not drop any years for your education years then how you will claim for a gap certificate from your school authority.It will be a illegal practice on your part in which you may implicated with a illegal offence for doing this type of  unlawful action.On the other hand you be convicted for this trial of illegal action. And the purpose you are saying about for this Gap certificate for submitting this certificate in TS Eamcet Counselling.Try to get things in honest way to bring your future bright and remarkable.
Hope.tnis helps.