I don't want to take the second quarter of quantum mechanics, since I can easily self-study the material and since I'd prefer to take graduate level courses in some other field instead. It's not required for the physics major here. Does it matter that much if I don't take it?
Same goes for classical mechanics (although it's more because the teachers teaching it have very negative reputations).
EDIT: Okay, for clarification, I'm only talking about whether or not it will matter for admissions (I actually generally do learn better through self-study than through courses). And mostly with respect to astrophysics grad school.