In short, I had a lot of concepts that were directly from World; I was like you got to be kidding; it was as if USMLE World paraphrased the question. For example; Thiazides for postmenopausal osteoporosis if they are also hypertensive.
I haven't gotton my results back, but based on my experience Golgan Audio, USMLE World 2X (I wrote down every question/concept) and was able to review it this way, and First Aide are enough to get at least 220 range.
I felt confident afterwards as did other classmates that used World.
Also, that last 2 weeks or so of intense cramming was helpful. I memorized 2 formulas for Biostats the day before because I had "stars" on them in my notes. I put the stars because in World they said "comes up very often" or something to that effect and sure enough Odds Ratio and the other calculation was there.
The exam is not as hard as people make it out to be. By that I mean, I found that I was able to at least narrow it down to two for the tougher questions. For example, tongue deviates to the same side as the lesion, so there was only two choices with the correct side.
I can go on and on, but in the end the best advice is to SYADAS.
Sit your ass down and study. LOL. Best of luck.