i can't talk about the real exam, but i did uworld during my 3rd and 4th semester, finished it, then did RX/Kaplan and i just went back to look at some old Uworld questions and its crazy how much better the question quality is in general when you compare uworld to kaplan/rx. from what other people have been saying the real exam isn't out to trick you, unless you're depending on buzzwords as crutches, and often, if you think that they are trying to trick you (like kaplan made me feel at times) you end up over thinking the question and getting it wrong. much the same for uworld, they definitely have some hard and tricky questions, but at the end of the day, their explanations are so much more nurturing and informative, they actually explain some pathogenesis, and even the distractors are selected with a purpose, but then they'll explain why you actually got the question wrong, rather tthan Rx/Kaplan explanations for some questions Correct response:A, vitamin A deficiency can result in metaplasia. B-F; incorrect. deficiencies in these vitamins do not result in metaplasia. then kaplan/rx give you a picture or page reference to FA/medessentials. which are useful, but uworld gives you a specific diagram when applicable, which i've found to be more useful.