The problem of not being admitted to the university should be discussed according to the specific situation. Every school's system is different, so whether it is serious or not needs more reference, such as your own wishes. Let me talk about this topic according to my college experience.
1, if you want to continue your graduate studies or get a scholarship, you must not fail in college for four years. The consequence of failure is that the things I listed above have nothing to do with you. Many universities are like this at present. If you fail in any subject, even if you do well in other majors, you won't get the scientific research quota, scholarship quota, or three-good student quota guaranteed by the school, because the primary criterion for evaluating these quotas is not to fail. If you fail, don't say whether you can be evaluated. You're not even qualified to evaluate. So it's really best not to fail in college for four years. Although it will not be punished, it will miss many opportunities.
2. If you just want to finish four years of college study and then go out to work after graduation, then your college failure is not very serious. Because you can take the make-up exam after you fail, even if you pass the make-up exam every time, you can take it again, but if you don't take the exam again, it may be difficult for you to get your diploma. Moreover, if you fail the course and others go home for a holiday and eat, drink and have fun every day, you have to go home with your books on your back to review and prepare for the make-up exam next semester. Besides, every teacher is different. Some teachers may think that your make-up exam is too pitiful, so some questions will be much simpler than the normal final exam, but some teachers will not. So when you make up the exam, the questions given by the teacher may still be as difficult as the normal final exam. Besides, if you fail in the final exam, are you confident to pass the make-up exam? A teacher taught you and took you to review during the final exam, but you learned it all by yourself when you made up the exam. Isn't it harder? Therefore, although there are opportunities to make-up exams and retake exams during college, I suggest that you can work hard once and fail without failure.
3. How to avoid failure? First of all, we should take good professional courses, take notes in class, and use them for the final exam, and pay more attention to the key points spoken by the teacher. Some teachers don't use textbooks at all in class and don't take textbooks in exams. They all use PPT, and the exam is also the content of PPT. So it is really important to take notes according to what the teacher said in class. Don't say that you will turn over the books when reviewing, because the focus may not be on the books. To have certain test skills, those questions only need to be memorized, and those questions need us to use logical analysis. These are the best classifications to facilitate review. If you don't know anything at ordinary times, ask more teachers or classmates, so that you can review the key points and subjects efficiently, and don't pile up all the subjects a few days before the exam.