Most countries don’t have colleges like the American ones. It’s called University and you only do things related to your degree. We also don’t normally do the whole major and minor thing. It’s very weird that you have people in who aren’t doing a chemistry course and take chemistry classes in degree level education. Instead in most places you do college or sixth form before starting University, that’s a separate institution. College and sixth form does some of what high schools do in America (starting at 16), but are also just a general educational institution that anybody can attend to do any number of different qualifications. Some even offer courses that form part of a degree where you spend your last year at University.