I passed AUD using Becker. If you've done just a tiny bit of auditing, the tracing & vouching questions are not too difficult to tackle. Like Deepa mentioned, it's very much a reading comprehension exam, where 2 of the answer choices are usually easy to knock out b/c they're pretty outrageous. In each Becker chapter, there's only maybe 3-5 concepts that are being tested, so it becomes pretty obvious what the test question's purpose is. It's a very qualitative exam, so there's less technical concepts (like in FAR), and less volume.
And b/c of disclosure reasons: Other than "experimental" test questions, keep in mind that it's VERY expensive for NASBA/AICPA to come up with NEW test questions (hiring test writers, having questions reviews for clarity, vagueness, fairness, timely concepts, etc), so these organizations stick with what's been tried and true...
I really can't pass again!