Did you mention to your tutor BEFORE your exam that your current situation may mean you underperform? If not, then I doubt they will adjust your mark. However you need to urgently speak to your course tutors to see what your options are, especially with your history of high marks. It is very unusual for a course to require you pass all of the modules with such a high mark - are you sure you have understood the requirements correctly? There must be an option to re-sit the exam? Anyway, speak to your tutors ASAP, point out your consistently high marks and ask if there is anything that can be done. Good luck! x