<p>For some of the AP tests you can get a 5 and still get a significant percentage of the questions wrong. So even with a 5 a student could have big gaps in one particular area of the subject matter. It does not matter that much in subjects like English, or subjects where the student does not plan to continue to study to the next level. However, if it is a foundational subject (like Calc or Physics for engineers) michal’s method is probably the best. Repeat the course unless you can confirm that the HS course has really covered everything in the class.</p>