I don't think you need to memorize them but I'd definitely spend some time with the questions labeled as previous exam questions. Those were in my experience, and not surprisingly, very valuable for getting a feel for the test questions. People on this board tend to spend a fair amount of time dissecting some fairly obscure and contrived practice problems i.e. EPS calcs a half dozen different different stock splits and what-not. While those are certainly worthwhile for the sake of understanding the material, I think that alone will leave you unprepared for what you'll actually see on the exam. My opinion is that there's just too much material to be jacking around with brainteasers.