> But not only that, children of all social classes go to the same schools

That's quite a fantasy - many people in Europe who can, enlist their kids in private schools because they don't want them to go to integrated schools. Why? Because in cities like Amsterdam integrated schools usually have a big amount of children of immigrants who are poorer and harder to teach. So the teachers who go there are also oftentimes not the best (since the best teachers go to private schools). I'm not saying everyone does this, but it's getting quite common for those who can afford it.