I don't remember a thing about Calc II. But I remember Calc III, seems like I spent a semester triple integrating functions..one after another to figure volumes of irregularly shaped object derived from a goofy function...
I'm taking Calc II at a community college this summer. It's the one without all of the trig (Calc 16B) and I hear it's so much easier than the other one (25 series?). Fortunately this one counts so I'm taking the easy route.
I wound up withdrawing from Calc II because the first exam was coming up and I felt as if I had learned nothing. Thankfully, it turned out to not be required for me. Unless you make an effort to learn it (meaning homework, extra studying, etc) it'll be in one ear and out the other.
I used to be an engineering major (a long time ago) so I took the whole sequence of calculus (1-4). I know you don't want to hear this, but for me, calc 2 was by far the most difficult of the four. Good luck.