This question is inspired by what Steven Krantz wrote in his book "A mathematicians survival guide."
If you are an American student, educated in the USA, then you may find that the international students in your graduate program appear to be way ahead of you. First of all, students in Italy, France, and other European countries often specialize much earlier than we do in the United States. They have had many more advanced math courses than you will have had. [I was once told that a typical Italian math student graduating from college will have taken 22 year-long math courses. I have not had 22 year-long math courses in my entire life.]
If this is not true, then in your experience, from which countries/universities do you get the most advanced graduate student?