Of course not. First of all, it doesn't matter if you don't take an elective course, because you just need to take enough credits. You can get enough credits before you graduate from college, no matter when you take the exam. Universities can take eight semesters. Followed by compulsory courses. The so-called compulsory course is the credit you want to get. If you don't take the required courses for one semester, it means that all the required courses for this semester are zero, which has nothing to do with expelling you. For example, some people fail all the required courses for one semester and are not expelled. Expelling is a serious violation of school rules. Does it matter that you didn't complete all the required courses in one semester? Actually, it's not very serious. Generally, our school will check the failure rate once a year (not until junior year). If you fail too many courses, you will be advised to repeat the grade and will never be expelled. In a special case like yours, you can explain to the school that it's not that you really can't do it, but that you didn't choose courses. If the school allows you not to repeat, you can repeat with the next junior. Of course, there is also the best result, that is, you go to the academic affairs office now to explain that you forgot to choose the course, and see if they can help you choose the course again.