I'm from South Korea and our school have a fixed class usually for one year and structured fixed timetable. So we take a class in the same fixed classroom with a group of classmates for an year. And almost, timetable is chosen by teachers so we couldn't usually choose what kind of subject we'll take. And every year, that fixed class is changed. So we meet and make new friends every March(we start the semester every March). That would be sort of nervous and hard thing to some children who are shy, introverted. So there is a word in my country called "new semester blues" which means that children would get ill or not sleep well. I heard and know that in case of US, their school is more similar to the university. So they could choose the subject if they're interested in that class and there is a no fixed class and classmates. So I heard that they could make friends with different and diverse people throughout the different classes. How about the school of your countries? I wanna hear from you guys. :)