This question already has an answer here:
What governs when people go into different stages of education? I have noticed at different times that my Grade School might be full, High School empty, and College have a few people.
I know that people won't go to school if they are not available, but do they only go to school if jobs are available within that education level?
Question flagged as a duplicate, which is fair enough, but the answer given provides a better answer than the original thread. Can both be merged?