Average AM Score to Pass

I’ve been on these forums for awhile.  I have seen percentages anywhere from 50% to 70% or more for what people are trying to score on the AM section.  What if any of these are relevant?  I know from Levels I and II the rule of thumb was that you needed to score about every 2 out of 3 with 70% just to be safe in order to achieve the Minimum Passing Score.  Are there rules of thumb for Level III aside from “score as many points as possible?”