<p>lol. No, not Physics C, and not Biology. Those aren’t bad, but they cover a lot of material.</p>
<p>I self-studied Environmental Science (4), Psychology (4, then a 5 the next year), Chemistry (4, then a 5 the next year–but AFTER taking an introductory chem course first), Human Geography (5), Comparative Government (4), and English Literature (5).</p>
<p>I would say that all of those but chemistry are pretty easy to self-study, and that a prep book is sufficient study material. I tried art history but that turned out very difficult for me, because there was too much memorization and I am not good at memorization. Other people may have different experiences, though. The easiest test to prepare for is definitely human geography. Psychology would probably be the next easiest, and then comparative government (though I never got a 5 on that 
). English Literature is easy to prepare for on your own if you already read and write a lot for fun. Environmental Science (again, I didn’t actually get a 5 on this one, but I didn’t start preparing until a few days before the exam) has a lot of overlap with Biology.</p>