>>12239895I actually did a triple degree in math/phys/biochem. It really depends on the class. I found EM to be the most difficult subject but I had a weird schedule where I took EM as soon as I finished the general physics sequence. Typically students will have optics and a modern physics class under their belts before jumping into quantum/EM.
Human A&P required the highest amount of rote memorization.
I do well in school except writing so the class I spent the most time on relative to others was technical writing...
For record my only two classes I didn't get an A was in EM and Evolution (biology course).
Complex analysis and Abstract algebra were my favorite classes I took in undergrad, but maybe those two would be the most difficult for your typical student.