If the school has no regulations, the department has no right to let you fail! At present, all universities have student management committees or student complaint offices. You should read the rules and regulations of the school clearly. If the school has no regulations, you must remember to complain! Besides, personally, I think you should study hard! Even if you don't repeat a grade, you should study hard and try to pass the make-up exam, otherwise you won't get credits for so many subjects, and it's hard to get diplomas and degree certificates!