I am very confused about this A level grading system. I am talking about for Bio and Chem btw. So I thought you need 90% across all AS and A2 to get an A* which would be ums 540/600. But when I searched up on google, it said, 80% in AS and 90% in A2 units. So 80% is ums 240 and 90% is ums 270. So when you add them, you only get ums 510/600. So is it like as long as you get A in AS and 90% in A2, it's an A*? Someone pls help me out. I've never been this confused in my entire life.