Hi gmatscore790,
As the other posters in this thread have already pointed-out, the two scheduling systems (for the Test Center GMAT and At-home version of the GMAT) are different systems - and unfortunately, you cannot reschedule a Test Date from one format to the other. If you're certain that you do not want to attempt the At-home GMAT on your personal computer, then you have two options - use a different computer or cancel that appointment (and the earlier that you do that, the larger the refund will be). You might still potentially be able to schedule an Exam at a Test Center on June 15th - but since the number of available 'spots' in any given Center is limited, the sooner you get online to check, the better the chance that you can choose a specific date and time for your Exam.
How have you been scoring on your CATs/mocks? What is your overall Goal Score?
GMAT assassins aren't born, they're made,
Rich
Contact Rich at: [email protected]