Comment by zozbot234

The problem with that sort of tracking is that no one wants to be stuck teaching kids with "medium" and "low" skills. So these kids are going to get matched to the worst, lowest skilled teachers, and no chance of realistically getting back on the "high" track! You can of course fix that by rewarding the best teachers and training them better in effective instruction methods (i.e. nope, the kids aren't going to just "learn stuff on their own"!) but guess what, both of these are political anathema in the public schooling system. Especially in the U.S.