@MylifeisCPA: I can't comment on Wiley, since I use Becker. In my experience, the Becker homework is much more detailed than the exam. On both BEC and FAR that has been the case. I wouldn't suggest skimming over the ones that are difficult, especially since many are good ways to learn or think about certain topics. Conversely, don't sit and try to learn a particular exception or application of a rule or question either. I know people talk about the CPA as if it's a miserable and ridiculous exam, and in many ways it can be frustratingly difficult/random, but honestly they really do test the basics. Becker goes into serious detail that in many cases couldn't possibly be tested on the exam. For example, FAR has 90 MCQ's and 7 sims. If you average 2 minutes per MCQ that leaves you with about an hour for sims. Adjust a bit up or down if you like for MCQ's, but give or take 2 minutes will be your average on those. Some of the Becker questions take longer, even when I know what I'm doing. My advice for those, learn what they are trying to teach you, but don't worry if it's still difficult. In FAR review, Becker has a TBS that makes you derive an entire statement of cash flows. Ludicrous! There is no way you would be asked to do that on an exam. Worst possible would be to get cash flows from operations or something like that.
My point is, study hard, but don't let the tough questions get you down.
As far as homework scores, I typically got in the 70s, few in the 60s, and a few in the low-mid 80s, and you can see below how my exams turned out. Good luck!
BEC 86 (08/30/11)
FAR 84 (10/13/11)
REG 88 (11/08/11)
AUD 86 (11/29/11)
Exam prep - Becker self-study