Universities are generally not allowed to skip classes. Because professional learning in universities is a gradual process, it is a teaching process from public basic courses to professional basic courses, and then to professional compulsory courses and professional core courses. If you skip a grade, it is impossible to learn your major well, which does not conform to the law of talent training in colleges and universities, so colleges and universities can't skip a grade under normal circumstances.

University:

Universities (colleges) are a kind of schools that implement higher education, including comprehensive universities, specialized universities and colleges. It is an organization with unique functions, an institution of higher learning that inherits, studies, integrates and innovates advanced academic knowledge, and is interrelated with social, economic and political institutions.

It is not only the product of the development of human culture to a certain stage, but also a unique culture gradually formed on the basis of long-term school-running practice through historical accumulation, self-efforts and external environmental influence.