Second response: I'm not sure I really answered your concern head-on, so I'll respond again. There's a widespread belief that American schools are fundamentally broken in some way, which has led them to provide inadequate educations. So, that would be basically all kids, with allowances that some kids will probably learn on their own and succeed anyway, and some schools are probably way above average. But the perception is that schools aren't doing a good enough job of preparing kids to succeed as adults. (I wonder if they have considered that ignorance = bliss.)