Hi kochikaame,
Currently, you can take the At-home GMAT just ONCE (regardless of whether you accept your Score or not). This one attempt does NOT impact the number of times that you can take the GMAT at a Test Center (nor WHEN you can schedule those attempts). Under current rules, you can take the Official GMAT up to 8 times at a Test Center (but you have to wait 16 days between attempts and you can take the GMAT no more than 5 times in a 12-month period).
Approximately 3 weeks ago, you posted that your July appointment had been cancelled. Were you able to reschedule your GMAT at a Facility?
GMAT assassins aren't born, they're made,
Rich