lab     = mark for programs/quizzes (out of 8+8)
midterm = mark for mid-term test    (out of 12)
assn    = mark for large assignment (out of 12)
exam    = mark for final exam       (out of 60)

if (exam >= 25)
   total = lab + midterm + assn + exam
else
   total = exam * (100/60)