I imagine pchem would be very challenging if you didn't have a significant amount of mathematical sophistication. A lot of the ideas with quantum mechanics, solving PDEs, eigenfunctions/vectors,basis sets, multiple integration, probability (expectation value) come from higher math than what is required (calc 2 or 3 depending on the school).
I took multivar, diffeq, linear algebra, abstract algebra (group theory), probability, before I took quantum and it makes the class a lot easier if you just have to learn the CHEMISTRY side of it and don't need to worry about the mathematical part. It's still very weird, but it's kinda a fun class when you see how all the math you've taken comes together.
Even though I've had some tough math courses, latin was the only course that kept me studying through the night because I was terrified I would not be able to translate anything on the test the next day.