How difficult are the USAPhO exams (f=ma, semis, etc) in general? How competitive is it compared to other olympiads? I know these are vague questions but I just want to get a better idea of the general difficulty of this olympiad.
How difficult are the USAPhO exams (f=ma, semis, etc) in general? How competitive is it compared to other olympiads? I know these are vague questions but I just want to get a better idea of the general difficulty of this olympiad.