I meant rollback of a policy that performed poorly. It is an interesting point you bring up about rolling back a child that I haven't considered. That might be

I meant rollback of a policy that performed poorly. It is an interesting point you bring up about rolling back a child that I haven't considered. That might be a good policy to have. A question to ask is it better for a kid to score 90% in algebra and it takes 2 more years or is it better that they score 50% and then move on to calculus. That would be a good A/B test to compare their lifetime earnings. My hypothesis is that calculus is a pretty useless skill and basic maths is more important in life. There could be ways of doing A/B tests if the standardized tests are the same between states that have different curriculums.