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<p>I know a student who did it at my school. He got a 5, but he worked with the chem teacher at our school to get practice and help with difficult concepts. Generally, due to the level of understanding required to do well, I would recommend against it. Also, chem requires significant application of general rules and concepts.</p>
<p>If you are doing it for an extra AP, it may be worth it. However, no college will give you credit for the exam if you haven’t taken the class because you will have missed all the labs</p>