AP exams are so popular with high school students you might think they are required. They aren't! AP exams are, however, a great way to get some external documentation of learning - to prove that your student is learning. Colleges aren't always confident in the quality of education their applicants have received, whether they come from public school, private school or homeschool. When they get test scores from outside agencies, they can have some confidence that the student knows the subjects that are written on their transcript. Some parents use AP exams for outside documentation, but there are other options. You can pursue SAT Subject Tests (sometimes called SAT II tests,) community college classes, or CLEP exams. Regular SAT and ACT tests can also provide some "proof" for colleges that want documentation in addition to a transcript.
Have you pursued external documentation for your homeschool student's education? If so, let us know what worked for you!