On the sims, work the microsoft press book examples. Why? Because it isn't just you get them right, but HOW you got to the answer. MS has its own way of getting from A - Z. For example Disk management. Me, I right click my computer then manage to get to it. MS might want you to take the long path to get to it instead.
Not sure how dead on this is, but the guy did get a 1000 on the test