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)