Sorry for double post... I am not complaing but 84% for an A ? wouldn't it be between 77-82% ? (77% in January 2013)
It varies depending on how difficult the paper was. I'm guessing that the January paper was more difficult than this one. There can be really large differences in grade boundaries. E.g. There have been M2 papers that were 68 or 69/75 for an A (and 72/75 for an A*) whereas the C3 paper this time was 50/75 for an A.