I understand what you're saying, but think about it like this ... We aren't seeing the entire population of each school. My takeaway from this is that there was some kind of decision made at each school, and only a certain portion of the classes made the trip to Hogwarts.
In Harry's year, there are five girls and five boys who make it into his House. That makes it around 40 kids each year, if we assume the population stays roughly the same. We didn't see 40 kids from either of the visiting schools, so it stands to reason, just a portion. Since it's not revealed in the film how those decisions were made, we just have to accept it.
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