"Sorry, but this is also not true. I was at the Realschule for a couple of years and afterwards went "down" to the Hauptschule. The best teachers, by far, were the ones at the Hauptschule. They knew exactly how to talk and how to teach the young people. Now I'm doing my master's degree. Diversity at the Hauptschule, in my eyes, was catastrophic as it resulted in groups divided by ethnic background in combination with brawls and lots of bullying. I'm not sure if a Gesamtschule would be a good solution, but the current system is also wrong in many ways (education content, no creativity, no free thinking, ...). "