But Teachers know about the classroom, and how to handle difficult kids. Well, good Teachers do anyway.
Improve it? Offer more practical lessons in the early secondary years. Perhaps as an alternative to more academically pointless subjects, like RE (and I did that at GCSE), or even as after school stuff.
Get kids interested young, and show practical applications of stuff they're learning in other classes. I don't know about you, but my Maths lessons had nothing to do with my Technology lessons. Linking the lessons in that way would help.
Pure academia has failed.