This is the response that I got from a 3rd year (going to be starting 4th year in July and applying to neurosurgery).
Hey Tablet PC,
Yes, you are absolutely correct in noticing that the NBME questions are much easier than the practice test questions (in USMLE World). Like I may have hinted to in my hints about Step 1, the vast majority of the questions will be pretty straightforward. It's only about
1-2 out of every 10 that really make you think or ask about an obscure piece of knowledge. If you took a full length, timed NBME practice test and received your score... it should be a VERY accurate predictor of your performance. I hadn't even studied Biochem, Pharmacology, OR Microbio and I took my practice test and got within TWO points of my actual score. I've heard similar reports from people... like 5-8 points away from the actual score.
Take Care,
Ivan