How odd (from a British perspective). Successfully challenging an exam result here would involve going to the Examination Board with proof of extenuating circumstances. And never happens as a result of people disagreeing with how their exam script was marked, for a start because we're not given our exam scripts. (I think a few unis do allow you to request copies, but they make it very clear that there's no possibility of disputing the mark you're given. Which seems unfair, but presumably they just don't want to have a precedent - if someone successfully challenges a mark, everyone will start doing it).