While there may be some delay in College Board updating its website and emailing students, in most cases, the test centers themselves cancel the test, not College Board. There is the sense of coordination difficulties within the school. Speculation: perhaps a school staff person (who may be subcontracted to College Board) struggles to get permission from the school administration to hold the test and/or not enough teachers want to proctor (also subcontracting to College Board). Overall, the relationship between test centers and the College Board is an odd one.