Why are you self-studying in the first place? Self-studying adds next to nothing on a transcript. Colleges have already pointed out that admissions isn’t a matter of the number of AP’s you have. You should only self study if you need college credit, you’re passionate about the subject, and it is not offered at your school. Colleges want to see you doing better in your free time. If you only want to take a course online because of its AP status I suggest you not. It really doesn’t do you any good unless it’s a course pertaining to one of your interests or what you plan to major in in college.