Self Studying AP During Summer

      Hello, I'm an upcoming sophomore who is currently self-studying AP Psychology. I chose to self study it because it seems interesting and a background in Psych would help me in college with Psych classes I have to take for my major (Not being a psychology major tho) and possibly even earn credit for them depending on the college I go to. My plan is to finish reading Barron's, (I'm currently on Chapter 12) make homemade flashcards with ALL terms (to cement them in my mind) and finish watching Crash Course Psychology videos on YouTube. I even made my own meme/vine compilation with Psych terms on YouTube all to cement these vocab terms in my mind, which, according to most people is very important as AP Psych is considered a "vocab" test. One of my friends is also self-studying AP Psych, so we help each other out if we don't understand something. 
      Anyway, I was wondering about other people's opinion if I could also begin to self-study AP Environmental Science this summer? It's still early in summer and I'm almost done with Psych, so I have plenty of time.
      For a little background, I took an AP Human Geography course freshman year and kept high grades in the class, and I believe I got a 4 on the AP exam. So I'm familiar with how quickly time goes by in the mcq and frq sections of AP exams and how to juggle sports with AP classes. Psych is coming along a lot easier than Human Geo ever did, probably because I actually enjoy the subject much more than Human Geo.
        My question is, should I add Environmental Science to my self-study this summer? And, will weekly flashcard reviews during the school year (Probably one unit every week or something like that) be sufficient to retain the knowledge? (of course with a more thorough review when exam time comes)

If an end goal is to go to an in-state university, or even if not, it probably would be much easier to just take the Psych class over the summer at a local community college. Or even during the school year, it’s a one quarter or one semester class. The class is probably more transferable in many cases and you’ll get the class over with in 6 or 8 weeks rather than a whole year, and in many cases the class is offered online. In some universities, AP classes aren’t accepted at all, has limited acceptance, or can’t be used for GE or breadth classes, while community college classes can.

I never even considered that, thank you for your input.