I'm graduating soon and wondering: how do you know when you've learned what you should have as an undergrad? I know I should have learned E&M, mechanics, thermal, QM, some optics, modern physics, etc., but how do I know if my proficiency level is high enough? It is tempting to think that the physics GRE is some indicator of this, but then the ave. score for American students is quite low, so I don't know (it's even lower for students at my school). Anyways, I just want to gauge if I know enough before I bound off to grad school. My undergrad. program isn't even ranked, and although I feel proficient, I have no idea what physics is like at other universities... I feel pretty good about opening any of my textbooks and chugging through problems, though I can't derive everything from scratch without peeking, and sometimes I have to look up formulas that I forgot. Does this sound like okay proficiency?