You know, i never did vector calculus in calc 3? you know, things like Green's theorem and Stoke's theorem, etc. i also never touched integration in calc 1. neither did i do polar coordinates in calc 2. among a lot of other topics! i did calc 1 and 2 at a liberal arts college

It seems to be the general consensus that calc 2 was the hardest and calc 3 was the easiest. i disagree, i think calc 1 was the easiest, it was the closest to pre-calc, which i love, and your biggest problem was algebra. not the case with the other two calculus courses. for those guys, getting the concept and setting up the problem was the hardest. you wished that they would give you a straight forward problem with killer algebra. but half the time, you don't even know how to set up the problem so you can do it. this is generally not a problem in calc 1. it is pretty much straight forward. i found calc 3 was the hardest, but maybe it was my professor. (i usually don't blame my professors for anything, so you know how bad it is here)