Ok, so I'm very confident that I know *almost* everything about hardware, but I hear there's also an Operating System portion of this exam. Anyone that has already taken this exam, can you please let me know some examples of the difficulty of the questions? Whether or not you thought it was hard/easy, and how advanced you consider yourself? I'd like to take it, but I want to make sure I'm totally ready (so I don't waste my $$$).