Have read "The Smartest Kids in the World: And How They Got That Way" by Amanda Ripley a few weeks ago and it was very interesting to see different school systems from Finland, South Korea etc. It was especially concerning for me to read that math teachers in US doesn't need to take many math classes to be able to be a math teacher.

It's a content for another thread maybe, but class sizes probably is not the only thing that needs to be fixed here in school system.