For high schools that grade using the point system (A is 4 points; B is 3, etc.). A I understand it, 4 means perfect. So how is it that some students end high school with better than a 4.0 average? I read a news story last spring about a high school that had several students who were valedictorians in this year's senior class - they all tied with 4.8 (I don't actually remember what the number was but it was considerably higher than 4.0) averages.
How does that happen?