One concern I always have with the mastery approach is that I find that I understand a subject much better once I've learned the next thing, so maybe the ideal path is something more like "You should always be able to 100% the subjects you learned six months ago" or something.
Though depending on how seriously we take Bloom's two sigma problem (I'm never sure how much we should) the opposite may be true: A student should be able to 100% a test before they are ready to move on to the next material. Maybe we just take too long to get them to that point.
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