well actually 225 students per class is the usual number, if that's what you're asking
"And do you guys know if being an international will play a major role?"
that's a great question, i was wondering the same.. cause they don't mention anywhere if they have a "separate" waiting list for intl students.. i mean from 225 people, they usually have 15 as internationals. from the 675 people that they've admitted, round 40 should be intl. if we suppose that from that 40 people, only 10 enroll at caltech, will they aim to admit exactly 5 more from the waiting list? or if 20 enroll, they won't even look at the intl from the waiting list?
"And would nationality play a role? Will Caltech reject a person from country X because there are enough people from that country?"
officially, there should be no differences