Posted this on another thread but wanted to share it here:
"I’m assuming that you’re aiming for selective schools b/c of the sheer number of AP courses you’ve taken, so see the following which is by Harvard’s Admissions Dean: https://thechoice.blogs.nytimes.com/2009/09/11/harvarddean-part2/
"We have found that the best predictors at Harvard are Advanced Placement tests and International Baccalaureate Exams, closely followed by the College Board subject tests. High school grades are next in predictive power, followed by the SAT and ACT. The writing tests of the SAT and ACT have predictive power similar to the subject tests…
At Harvard the more curriculum-based tests such as the AP, IB, and subject tests are the best predictors of college grades. More research is needed to determine whether our experience is replicated elsewhere, and there was great interest on our 2008 NACAC Commission in developing future tests that would encourage students to focus on their high school curriculum rather than the many costly and relatively ineffective test prep programs. These programs, on average, boost scores by only 20 to 30 points on the old 1600 point scale."
While the article is a bit outdated (2009—when the SAT was out of 2400,) it still has extremely helpful advice. Although standard testing as a whole is rife with problems, AP/IB (and subject test scores to a lesser extent) are extremely helpful in reinforcing your school grade.
Think about it this way: will students do better on a tests set by their school teacher where the teacher’s teaching them exactly what is and isn’t on the tests (b/c they wrote it) or on a test that isn’t created by their teacher and their teacher doesn’t know exactly what’s tested (i.e. they have to prepare them for any concept that could show up?) Students would do better when it comes to their school grades, and this is why AP/IB test scores are useful: to show colleges that you didn’t just get an A or a B b/c your school is grade-inflated but b/c you actually know the subject matter on a STANDARDIZED exam taken by students across the country, one that’s not written by your teacher.
So what does this mean for you? I highly, highly recommend taking AP tests this year (at least in your areas of interest) if you’re planning on applying to schools like Harvard: especially in a SAT/ACT test-optional atmosphere, it’s beneficial to have less biased tests (than your school grades,) in your fields of interest to show that you have a strong background in what you’re studying, and that you’ll be able to handle the rigors of the coursework at Harvard or elsewhere. Also, as @ucbalumnus states, you might be able to get credit for general-education or other introductory course requirements: saving time and money, as college is extremely expensive."
Hope that helps!