I think you (and others) underestimate how many students would "grade" their teachers in a biased and/or unfair manner.
These are kids we are talking about. And, at high school level and below, they are forced to go to school by law... not because they are serious about education.
Therefore, a good teacher who is serious about education is going to be looked upon negatively by many students... especially by "average" (as opposed to advanced/honors/AP) students who really don't want to be at school in the first place.
In fact, a good teacher would be in a bind... caught between their desire to raise the bar for students and their fear of risking their livelihood if/when bad student survey results come back. That's the situation this plan puts good teachers in...



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It is very simple, just showing the progression of scores at our hypothetical school. As we already know, every incoming cohort of sixth graders (next to the green arrows) has an average score of 30 on the test. As indicated by the yellow arrows, the next year, in seventh grade, they all pick up 20 points, for an average of 50. And, finally, they pick up another 20 points by eighth grade, and are promoted to high school (red arrows) with an average score of 70. In other words, thanks to the wonderful effectiveness of their superstar school, every cohort enters at 30, well below the state average, and leaves at 70 (slightly above the average of 65).

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