When you're taking the exam, read the entire question - don't just skim it. They'll throw stuff at you like "all of the following are not an exclusion except..." and crap like that.
When in doubt, always pick the answer that protects the client/consumer more.
If you're doing an online/self-study class, look out for things that tell you "in 2007..." or something like that. Some of the info on my course was outdated (specifically, I remember
HSA contribution limits were given for 2006, but I took the class in 2008 - and the test asked about upcoming limits in 2009!).
And relax! It's not that bad, really.