Standardize testing might have its place in education, but using it as an evaluation instrument is a waste to time and energy. The tests do not address reasons for lack of achievement, i.e. attendance, class size, prior educational experiences, home life, etc. Basically, the blame is always laid at the feet of the teachers.
Can you imagine a dentist being held accountable for all the cavities of a teenage patient, even though the kid doesn't brush regularly, refuses to floss and lives on a steady diet of sugar. Of course not. However, the government thinks all kids should learn at grade level regardless of the student's effort, attendance or support at home. When I taught, it was not unusual to have students start school three or four weeks late. I've had kids who missed over a hundred days of school in one year.
When I am King, no state legislature will mandate student testing until every member has taken the required test and had their results posted in the local newspaper. Now that's my idea of accountability.