The week or more used for testing, in addition to the weeks (or months) of test prep, is considered to be a waste of valuable instruction time by teachers. (c3s.nyc)
Meanwhile, teachers are frustrated that so many hours of valuable instruction have been replaced by testing, and that the results won't be available until students are moving on to other classrooms. (e4e.org)
In addition, each time a student is sent to the office on a discipline referral that student loses valuable instruction time. (thoughtco.com)