Some schools have that option. It's called re-takes, re-exams, etc. If you fail a course, they let you take another comp exam and get an F/C or sometimes even a C. Either way, it's sufficient to move on if you pass the exam.
Barry doesn't have that. If you get an F or a couple Ds in a year, you repeat the year to re-take those courses in their entirity (or get dismissed... depending on faculty group decision).