DS has always had a problem with one of his A level teachers who doesn't seem to like him (a vibe we picked up early on at parents' evening).
Some of it is of his own making, as in Year 12 he was a bit disorganised/lazy and didn't do very well in his mocks. However he admitted this and has pulled his finger out and worked hard this year.
We had a bit of an issue with this teacher when A level grades were being predicted as he predicted a B for DS on the basis of his mock exam, whereas all his other work pointed to an A being appropriate. In the end we challenged it with the school as it was important for his UCAS application and the teacher reluctantly changed it. However he said that he 'saw DS as more of a 'B' sort of person' and that DS would need to do something very 'different' to change that 
.
Anyway, DS has worked hard this year, but still feel this teacher dislikes him (and us) for challenging the prediction.
As part of his A level he had a piece of internally assessed work
(20%) which this teacher has given a 'B' equivalent mark. It is a small class and DS knows it is the lowest mark. Knowing the usual quality of the work of some of his peers, he feels that he has been unfairly marked harshly.
What if anything can he do? The teacher is also the head of dept, so there is no higher teacher to appeal to.
I don't know if all the projects get moderated by the board, or just a sample of them.
DS has been told he can appeal to this teacher, but he has no information about why he has been given the mark he has, so doesn't know on what basis he would appeal? 