Hey guys, never posted on here before, but wanted to dispel some fears (I'm in the same boat as everyone here, having taken it on 6/14):
@creative1982: there's no way in hell the scale is the same. First of all, you can't go by the number wrong because there are 322 questions on step 1 vs. 200 on the NBMEs. Second of all, the ridiculously high percentages on NBME are rendered impossible on the real thing by the simple fact that no perfect scores are recorded. The fact of the matter is that if it is possible to score a 98% or better on the real thing like it is on the NBME, then the odds are someone or multiple people out there would be reeling in 100%s, there's not.
My opinion and it's just that: I felt very well-prepared for the exam (88% on UWorld, average of low to mid-260s on NBMEs with a high of a 271). However, I know for a fact I got 12 questions wrong (great post-test memory) and I'm working under the assumption that I actually got in total 36 questions wrong (about 3x the number I know seems right to me). I was worried at first, but after discussing with others who were in the same boat as I was, the general feel was that a really good score is in the 87%-90% range. I'd frankly be stunned if there's people out there getting 96 and 97%s on this thing with all of the pressure, endurance, fatigue, ridiculous questions, etc.
Could be wrong, but I'd say high 80s will get you in the 260s