I hope this message suppresses the anxiety of those who took the test and are waiting and for those who will take the test soon.
I am currently an intern in urology, in my prelim gen surg year.
Just like for step 2 CK, I only used UW. I was able to do all the questions, but was extremely rushed as I only studied for 3 weeks occassionally after work (2hours), which was difficult since I was tired, and usually post-call (4 hours). So the quality of the studying was poor compared to 10 days for step 2 during a vacation month.
Anyway, I averaged overall, a 59% on UW, but my scores were never consistent, ranging from 45-74%. I thought UW questions were very difficult as well compared to UW for step 2.
I took the test last month and thought the test was very difficult, the hardest of the all the steps. Maybe Im just an idiot, but not suprising given my intensity of studying. I walked out of the first day thinking I failed but the second was much better, but combining the two days I was worried. It only took 21 days to recieve my score, in fact I wasn't even expecting it. I just opened my email and I had gotten my score back. Much, much worse than step 1 and step 2, but still got a 229. Comfortably higher than the score needed to pass. So if you are looking just to pass, then don't worry, cause if I passed, many others will too. Just remember its a 97% pass rate for US grads. I literally mark every question I was not certain of and I had at least 50% marked in each section, certainly an uncomfortable feeling walking out of the test given that this did not happen for the other steps. So hard...yes....passable....definitely.
Good luck and don't worry!