Finland has a revolutionary system with three teachers per class and 20 student caps
I wonder where this three teachers per class idea comes from, I've never heard anything of the sort, and I'm Finnish and have gone through said system. There is one teacher per class, sometimes an assistant, and two teachers per class in cases where the class size is very big. Because of cutbacks, we've had to stuff as many kids into a classroom as we can -- Finland is not doing too well at the moment when it comes to government finances.
But the system does have a lot of strengths, among other things the fact that teachers are well educated and it is a very respected profession with a lot of autonomy. They don't want to screw up the kids' futures a bit like a doctor wouldn't want to kill a patient, because it was competitive to get into teacher education to begin with...
Also, even though our school system does encourage kids to think for themselves, I would offer a somewhat conservative take as to why it works -- it really still is a somewhat traditional, teacher-led system. And of course it helps that Finland is for the time being a rather homogenous society where it is understood that if you are supposed to listen to the teacher, you are supposed to listen to the teacher.