Yeah, wanna keep STEP as the hardest exam, dunno why really, makes me feel big
Well, according to the Cambridge website, Advanced Higher Maths is equivalent to Further Maths. Also, scottish applicants still get asked to take STEP. I think we can assume that STEP is the hardest exam (aimed at 18year olds) known to mankind.
Quite similar to further, but with different modules all mixed together (there's a mechanics question hiding in the real maths! Kill it!). Although some of them are different to the kinds of questions we get - I've never seen a matrix one like that, although I think I could probably do it.