My lord, you guys are crazy. I just took CK yesterday. Studied just over 2 weeks. Spent the first day skimming boards and wards, the next skimming step 2 secrets, then the rest doing UW Qs.
UW was a pretty decent representation of the real thing. The real difference is that the long question stems in UW are usually needed to answer the question, whereas on the real thing a suprising amount of questions you only needed the last line. At the very end it would say, "You suspect Myotonic dystrophy, how is this disease inherited?" Stuff like that. Might help to read the very end first, it saved me a lot of time.