LOL, you're all dumb...
j/k
calculus is so easy. you don't even have to prove much of anything. conceptually, advance calc is not much harder but the reliance of being able to prove things is what makes it difficult. the hardest part of calculus is perhaps complex integrations, and some rediculously odd looking functions, and infinite series. e^(i*pi) = -1 blew my mind =)
differential equations is easy too... lol =) PDE can be a pain, sometimes.... series solutions to DE's are fun =)
abstract algebra sucks. A LOT!!!! it sucks to much, the term "is suck" can't even apply it sucks so much!
linear algebra is just matrices mostly... some basic group theory.
discrete math is okay, except for the part that deals with abstract algebra which SUCKS!!!