As the title says, my results are complete worlds away from what I should have gotten. For example I got a B if I recall correctly on my mock exam for unit 4 chemistry, and apparantly I got a U on the same unit on my final exam. This isn't the only case of this either, I got A grades on all my past papers for biology and physics but I apparantly got a C and a E on those two. Is it possible they marked my paper incorrectly or there was a mistake of some kind? Is there anyone I can see about this?