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<p>The AP test may be worthless for subject credit (though that depends on which test), but if the AP course is the best course in the subject at your high school, it is certainly better to take the AP course over a regular high school course in the subject.</p>
<p>For example, if your high school only offers regular Physics and AP Physics B courses (with the AP course being the better one), taking the AP course is better than taking the former, even if you choose not to take the AP Physics B test because it is worthless for subject credit at the universities you intend to go to.</p>