The French classes prépas system includes, during the first two years of undergraduate (post-baccalaureate) education, a series of regular oral exams, known as colles. Basically: every week during your first two years, you have two oral exams, each lasting one hour, with one teacher examining two or three students, each using a blackboard. A science student would typically have math and chemistry on week A, then physics and another topic (engineering, foreign language, …) on week B. This system prepares students for national competitive exams after their second year, which includes both written and oral components.
Now, whenever I have to explain that system to a foreign colleague, I have to do it from the start (as above) because I do not know any other similar system they might know (especially, I don't know of any equivalent or similar system in the US). Is there one?