1. Decline in academic performance: skipping classes will make students miss important teaching content and learning opportunities, which may affect their academic performance. Skipping classes will lead to insufficient knowledge accumulation, unable to grasp the main points of the course, and affect the comprehensive examination and the quality of homework.

2. Deduct points for absenteeism or mark papers: Some university courses require attendance, and absenteeism may be recorded in the attendance record. In some cases, the school may deduct scores or mark absent students, which will affect the final performance evaluation.

3. Miss the opportunity to interact with teachers and learn: In class, students can interact with teachers and other students, discuss problems, ask questions and get feedback. Skipping classes can't participate in these interactions and miss the opportunity to exchange learning with teachers and classmates.

4. Affect scholarships and degree applications: In some universities, scholarships and degree applications may take into account students' attendance records and academic performance. Absenteeism may adversely affect these applications, thus reducing the chances of obtaining scholarships or degrees.

5. Punishment and disciplinary action: The school can take disciplinary measures such as warning, detention and suspension of classes for students who seriously skip classes. These punishments will not only have a negative impact on students' studies, but also on their future studies and employment.

Generally speaking, skipping classes may lead to a decline in academic performance, missed interaction with teachers and learning opportunities, and be punished by the school. Students are advised to attend classes on time, arrange time reasonably according to their personal situation, communicate with teachers in time and solve academic problems.