Nikhil, GPAT has no correction window. But if you haven't submitted the application form, you can actually edit the fields. But if you have already submitted the application form, you cannot make any corrections or changes to your application form. When there are discrepancies in the information you have entered in the application form and the one that you are submitting as proof for document verification, your candidature might stand cancelled. So, you may have to re-register with a New Email id and mobile no# and fill in another application form. This means a new payment altogether.