I've gone back and worked it out, I couldn't work it out at the time because I'd overlooked the CA part so it made no sense. DS is one point off an A so that's why school are doing it. What I know and they don't is what he said when he came out of physics so I know that is low for a good reason.
I am looking forward to tomorrow when I can hopefully say that the first week of college has gone well. I did feel brave enough to ask about the scrum for the buses, I've driven past at the end of the school day and there isn't enough pavement for all the hundreds of teens waiting for buses. Apparently it is all fine, Ds and his friends have worked out a buddy system which pairs a six foot lad with a smaller friend so the smaller one can tuck in behind the big one as he ploughs his way to the bus door.
MyStudyLife is a timetable app that seems to be meeting with approval, it shows him when his homework is due which certainly meets with my approval.