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To be more specific, the grading scale (at least, for every version of IIDX that employs per-song grading except Beatmania US) is based on divisions of 9. If you get 8/9 or more of the total possible exscore, you get an AAA, if you get 7/9 you get an AA, 6/9 an A, and so on.
I find this easier to remember than the rounded percentage approximations of this listed above.
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