Ok I get that Demi, but Hawking is a genius and your system now has him down as average? So I am saying that taking a mean of all subjects just rewards all-rounders, not brilliance. For instance, I am USELESS at maths and science, but I get good marks in english, history, geography and religious studies, and ok in French and Latin (amazingly). But I bet my GPA would be average or just below.