for context, my dd attends a very very large well regarded sixth form college where departments basically work completely separately
on her biology mock, she got a B ( this was in feb -dont get me started on how i think it was far too early)
she got As on every test all year around minus one in jan which was deemed as unnecessarily hard by her teacher at parents evening. She got told at parents evening by her teacher with me there that she would get an A prediction post mock and she then went on to get a A on the next test. She has gotten a B prediction today. Shes really upset since she thought she would be getting A*AA so all of her plans are out the window.