Universities can skip classes in principle. Because modern university education generally adopts the credit system, as long as students can complete the required credits within the specified time, they can apply for graduation or advanced placement in advance. But it is quite difficult to operate in practice. First of all, from the perspective of learning content, university courses involve a wide range of knowledge and often have a deep depth. Especially in junior year, students need to study a large number of professional courses, which are not only numerous, but also relatively difficult. For most students, it is a great challenge to complete these courses in a short time, especially for scientific professional courses. Secondly, from the perspective of time management, the four-year university period is carefully designed to ensure that students can finish their studies within a reasonable time and have enough time for internships, internships or research. If you try to skip a grade, students will have to bear more study pressure, which may have a negative impact on their physical and mental health. In addition, the credit system is not just a simple accumulation of course scores. It also involves many aspects such as usual performance, attendance and homework completion. This means that students should not only get good grades in exams, but also keep in good condition in their daily study. This undoubtedly increases the difficulty of advanced placement. Therefore, although universities can skip classes in theory, it is difficult to operate in practice. For most students, finishing their studies at a normal pace is a more reliable and feasible choice. Of course, for those students who are particularly excellent and have strong learning ability, advanced placement may be a choice worthy of consideration, but more efforts and time are needed to meet the challenge.