Definitely not "swotting up!" [https://en.oxforddictionaries.com/definition/swot] Usually classes are taught straight thru, there's a study day or 2 (sometimes it's a Saturday!) then a week of finals follows directly. So no revision period except for the study day(s).
University of Glasgow spring term:
10 weeks lecture
2 weeks vacation
1 week revision
3 weeks finals
Typical American University spring term:
7 weeks lecture ending with midterm exam
1 week vacation
7 weeks lecture sometimes ending in a second midterm exam
2 study days
1 week finals
The whole university experience is different, which wasn't a problem in the "old" days (up to 1990, maybe later) when Americans studying abroad brought their own faculty and did not register locally for classes. The "new" system of making them an exchange student throws the student into a new bureaucracy and new culture, especially a new grading culture, and not always successfully. Grading a whole term based on one final simply never happens in the US at the Bachelor's level. I honestly don't recommend these newfangled exchange programs. Try to find the old fashioned kind, find an American university in Europe, or stick to short terms like summer or January, not for credit. Or just give them some money to travel around on their own.
Not passing judgement, but American professors, who are constantly grading homework, projects/papers, midterms, and finals, all of which they are expected to independently create, and lecturing 2-4 extra weeks per term, work a lot harder than their European counterparts.