GARP says they take the top 5th quantile (i.e.， whatever score cutoffs the top 5th “percentile”)， then they take a ratio (e.g.， 0.75) of that top score. I personally suspect the ratio (0.X of top 5%) is calibrated after the results are tabulated to approximate a ~50% pass result; or， best case， they use .75 of top 5% (e.g.， if 0.75* top 5% only passes a small % due to high difficulty， I doubt they would keep it).
　　But， either way， it’s really based on an (ex post) “grading on a curve” (no segmentation by section/topic， all questions weigh equally)...therefore: I do not think you can divine anything useful from the method. Unfortunately， it’s a waiting game.
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