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in general, there's no need for a curve. i somewhat agree with stephennn; i also want to point out that the collegeboard intentionally (and is good at) writes the test questions in such a way that they get the average score on each part as close as possible to 500, with a normal (symmetrical) bell curve distribution for the entire population on each test date.
technically, there is no curve b/c the questions already curve the test. the only time there might be some scaling is if there are some problems with disputable answers (which are usually clear--a bunch of people miss it).
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