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The whole system of state testing and linking it to teacher evaluations and school funding has basically created huge incentives to do exactly this sort of thing

Yeah. Don't forget that the schools are being forced to play the game by the legislature, at least in my state. I've had several teachers speak frankly to me about the system, and they hate it more than we do, but feel trapped. Their schools can be shuttered, their evaluations can plummet, and their pay can be docked if they don't produce the right numbers. What would you do, under the circumstances?