Most schools no longer do AS levels, and in england even if you do them, I dont think they count to ur final A level grade. In the rest of britain they can be up to 40% I believe. "At the end of the first year, you take exams in all your subjects. If you're taking a full A-level, these results won't have any impact on your final grade (although they could help shape your predicted grades). If you're just taking the subject as an AS-level, this exam will determine your final grade.". If ur in england these might just be predicted grades, and elsehwere u would have to ask the school directly how it will affect his final grade