I, too, was a bit on the slower side. I tend to be a slow-ish reader, and when you couple that with my need to hand write all my notes, it adds up.
I basically would take the lecture notes we were given (which were often amazingly detailed), my own notes from the recorded lecture, and any other ancillary sources and hand write my "master notes" for that lecture/lesson/whatever. I killed many trees and had binders upon binders of handwritten notes, but once I finished taking my notes, that was my master study resource. I never really had to go back to the powerpoints/handouts/whatever (except for an occasional diagram, or unless we're talking about Anatomy). I pretty much rewrote everything by hand, which I realize is way too time consuming for most.
I was in it for the long game, though. I didn't blow through the lectures at the pace of many of my classmates, and although I stayed on top of things (I made sure I hand wrote my notes for that day's lectures before I went to bed, even if it meant being up late), in the time it took me to do this many classmates had already gone through the lectures 2+ times. But the weekends were the time for reviewing my own notes from the previous week(s). I think I tend to be a very visual person/learner (which helps in Derm now), and more often than not when recalling a detail or concept in an exam, I could picture my own handwriting on notebook paper outlining/detailing whatever fact was in question.
Early on, it'd be a little disconcerting to hear other students talk about things I could only vaguely recall having seen on one pass; however, by the time the exam rolled around, I had mastered both the big picture and the minute details.
This all worked well for me and really helped me achieve long term retention, and it made Step I studying seem much better than it could have been. I realize that my methods are probably overkill for many, but it got me everything I wanted/needed, so I guess I won't complain.
