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<p>If both diagnostics were actually old exams, then both are completely accurate. The way the diagnostic works is that you take the exam in the same setting as a student who actually took that exam did. Then you score yourself the same exact way. Your diagnostic scores reflect how you would have done ON THAT TEST if you had been one of the students who actually took that test when it was administered.</p>
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<p>Agreed. CollegeBoard WRITES the exam, so if you’re gonna use a book to study from, use theirs.</p>