I have a similar issue with AQA, I've also been a A/B grade student all year for all my subjects, for AQA Psychology A I got a B for AS and in my Unit 3 ended up getting a U???? No idea how that works. It's basically said I got like 12/72 marks which I'm telling you, sounds ridiculous? I have no idea if that's a mistake or if I just really ****ed up?
I got into my insurance choice which I'm happy with, but the overall C grade doesn't look good next to me A and B...