I think you should ask your teachers about a regrade for your aps. Tell them that you think there might be an error on the grades. It is possible to ask for a regrade, but idk if they have a system for this year regrade yet as it used to have a regrade system for MC questions. If it is not possible then you should cancel your score, but this will be your last option. The same issue happens to me. I had all 5s for my previous aps, but this year I get only 3s and 4s while I was expecting to have straight 5s.