Sure. There are legitimate reasons to remove students. What's not really legitimate is pulling out all the high performers and leaving the average and below-a

Sure. There are legitimate reasons to remove students. What's not really legitimate is pulling out all the high performers and leaving the average and below-average students stuck with those legitimate problem students. It's more fair that the kid who excels in English gets put in the same class as the kid who struggles than it is that the kid who struggles with English gets put into the same class with the kid who makes animal noises randomly.