I took physical chemistry I, which was pretty much 4 solved systems, nondegenerate perturbation theory, using basis sets for quantum computer simulation, and electronic spectroscopy. We were assumed to know QM1, QM2, linalg, and bits of functional analysis coming in (in addition to vector calc, etc which everyone takes). Hardest class was probably graduate inorganic chemistry b/c the energy levels you get after group theory calculations are so unpredictable sometimes and it didn't interest me too much
(I felt I could've done much better if I actually wanted to enter that field)
I really hope I get to use this again in radiology or radiation oncology in the future.