for the US student: they went to private schools or, alternatively, they went to the wealthier public schools which teach these sort of courses, although usual

for the US student: they went to private schools or, alternatively, they went to the wealthier public schools which teach these sort of courses, although usually on a 'tracking' system which segregates the 'smart' from the 'not so smart' at around 12/13. for the US university (at least the more elite ones): the above, in combination of the fact that a big chunk of the of the students are international students.