I've just failed CCNA 640-801 exam. I got 801 ... hmmm

I'm disapointed as I feel I've let myself down and know I could have done better, I know I made a couple of
schoolboy errors on a couple of questions.
I think I messed up a router sim, but as there is no way of checking I can' be sure... do I take it as I failed on that?
Anyway, back to the books...