Statistically you will be fine regardless of what you do, so don't stress too much. The pass rate in recent years has been in the higher 90s. I did 4 long days of focused review of the Okuda book, got 95% of the way through it, then flew to Chicago, took the test and passed it.
Real talk. It was an unpleasant experience. You will find that during the real thing the examiners will not prompt or cue you as you have been told they will. They'll just sit there staring at you. A couple of my more elderly examiners seemed actively adversarial in how they approached their cases. The cases themselves are broad brushstrokes bread-and-butter EM and not terribly tricky, and the Okuda book is a pretty good subject matter review of the topics stressed. It's the format which is challenging, and in particular the eOral thing which is not terribly intuitive and tends to throw you by repeatedly popping up critical results without any warning (make sure to get as much practice in the practice room as you can before the test).
If I had to do things over again I'd do more partner-based practice. I don't think the course helps you quite as much as running through cases with a partner does.
I did have a classmate fail (after taking the AAEM course and reviewing Okuda) and from what he says there isn't a particularly clear path to retake -- and to make matters worse they only give you 2 years to try to wrangle a seat off a waitlist to do so. So try not to be that guy, as it's an unenviable position to be in.
