Generally speaking, universities need to be divided into classes, because it is convenient for management, because everyone studies different majors. Of course, one major is in one class, and then there are more people in each major, and each major should be divided into several classes.
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About university dormitories:
Different schools have different regulations on university dormitories. Some schools are divided into dormitories by name before the start of school, and some schools are divided into dormitories according to the order of registration. But most schools are a major or a school and a dormitory, and students from other colleges will not be assigned to your college.
Generally speaking, in college life, roommates are the people who spend the most time together, so we must have a good relationship with roommates. In this way, your college life will be happier.