That depends on the school, I guess! You're in college, right? I'm not sure what country you're in, if you're in the USA, then more likely than not you'll have to fix it yourself. Your schedule, your problem If you have two classes that overlap, and they actually do overlap rather than it just being a typo or computer error, then you have to drop one of the classes and try to find it again at a more convenient time or fail it, because obviously you can't be in two places at once!