Thank you all. DD felt that her third exam went badly, so the result was significantly lower than the other two. Apparently the lecturer told them that the content had been covered at A level, except that DD did Edexcel for biology, and everyone else did AQA. DD had never studied some of the topics, so she did as well as she could have done.
I asked her if she could talk to her tutor about catching up. but she says she doesn't have anyone she can ask. It isn't like being at school where she can ask the teacher. Surely there must be a point of contact for students if they need to talk about their studies?