Ah no, my intended meaning of “just-in-time” was definitely not in the sense of just-in-time-for-the-exam. In fact I think there is very little use for last-minute cramming... at most you can survive the test, but definitely not build fluency or understanding.
I was using “just-in-time” in the sense of just-in-time-for-the-lesson, e.g., if the tutor wants to teach concept X which requires knowledge of prerequisite concepts α1, α2, and α3, then the tutor can provide a quick review of these concepts before explaining X. Tutors can do this "custom filling in of gaps," whereas in a groups setting the teacher might be forced to say "you should know this already."
I was using “just-in-time” in the sense of just-in-time-for-the-lesson, e.g., if the tutor wants to teach concept X which requires knowledge of prerequisite concepts α1, α2, and α3, then the tutor can provide a quick review of these concepts before explaining X. Tutors can do this "custom filling in of gaps," whereas in a groups setting the teacher might be forced to say "you should know this already."