Hi beingink,
While the available appointment "slots" might vary a bit from Test Facility to Facility, most tend to follow a set schedule. Typically, there is a block of morning slots (around 8am - 9am, local time), a set of afternoon slots (Noon - 1pm) and a set of late afternoon slots (4pm - 5pm). While you might be able to find a slot as late as 6:30pm at an individual Facility, I would not expect most facilities to offer any appointments that late in the day. Obviously, we have no idea when Testing Facilities around the world might reopen - or even what their respective available slots will be when they do open - so you might want to continue your studies with the plan to take your GMAT at an earlier time of day.
1) On what dates did you take EACH of your CATs/mocks and how did you score on EACH (including the Quant and Verbal Scaled Scores for EACH)?
2) What is your overall goal score?
3) When are you planning to take the GMAT and when are you planning to apply to Business School?
GMAT assassins aren't born, they're made,
Rich