Xia Xiu and revision won't, but if it is Xia Xiu, your best score list will be covered, and now Xia Xiu will cost money.
If you retake the exam, it means that you have to make up those 4 points in one semester, that is, the credits in that semester will be less than 4 points. If there are many subjects to retake the exam, it is very likely that your report card will only get 5-6 points that semester.