ass1   = mark for assignment 1      (out of 11)
ass2   = mark for assignment 2      (out of 14)
quiz   = mark for on-line quizzes   (out of 10)
exam   = mark for final exam        (out of 65)
okExam = exam > 26/65           (after scaling)

mark   = ass1 + ass2 + quiz + exam
grade  = HD|DN|CR|PS,  if mark ≥ 50 && okExam
       = FL,           if mark < 50 && okExam
       = UF,           if !okExam