<p>And I’ve always wondered something about curves: Do they just look at how bad the entire test taking population did overall and then make the curve so that it gives a number the test takers think is appropriate for giving 5,4,3,2,1 to? And how does this account for better performance on tests themselves which is hidden by a more difficult test?</p>
<p>About six questions on the test are “trial” questions. The AP Exam doesn’t really count them for the score. In addition, yes the exam is curved by semi-mysterious ways, but the grading of the free-response questions is an exact science. They have really well-thought out rubrics.</p>
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