My best performance was intern year when I got 96th percentile after 8 days of anesthesia and no reading or studying of anything anesthesia. I recall the PD, assistant PD, and a few others being quite butt hurt about it (ret@rded, insecure, @ssholes).
Otherwise 96-99th percentile, top 10% basic, 99th percentile advanced.
Used M5 one year and then Truelearn subsequently. Did read textbooks for cases outside of that as well, but not specifically for exam study.