I would have to respectuflly disagree with Mr. slicebread. I don't think UWorld is exactly like the real thing, and you are correct, the NBME style is much more straightforward. Think of it this way, for many Uworld questions you will notice that less than 40% of people got the question correct, well in the NBME world that is not a good question, and in fact they throw out most questions that less than 50% of medical students get right.
So you have to get into that mindset when taking the exam. If you see a question and start thinking that this is some really complicated trick question, and "they might have fooled the rest of them, but they ain't going to fool me" then you probably veered of course. At that point stop, erase your mind and reread/rethink the question, you may have read the question wrong, or even missed something very simple. Because most of the time the answer is the simpler, more common choice, that more than 50% of medical students would get correct or know. Most of the time at least. Now out of of block, 1 or at most 2 of those questions were actually trick questions and maybe you get them wrong.. BUT you risk getting significantly more easy questions incorrect if you get into the mindset that every question is hard or some twisted trick. Also, you waste more time on easy questions.
The most helpful thing is obviously just doing more NBMEs. When doing them, analyze each question, always ask yourself what is the "teaching point/concept" that this question writer is trying to test. Make sure you can answer that question, before you try to answer the actual question. Because really it is the same concepts that pop up over and over again on the NBME, and the real thing. Like the ol' navy saying KISS ..