weekly_pracs = mark for weekly program exercises (out of 16)
fortnightly_quizzes = mark for fortnightly quizzes (out of 12)
large_assn    = mark for large assignment (out of 12)
exam    = mark for final exam (out of 60)

if (exam >= 25)
   total = weekly_pracs + fortnightly_quizzes + large_assn + exam
else
   total = exam * (100/60)