The level of supervision was huge for my kid, and probably the thing he/we considered the least. He was born independent and hates being told what he must to; on the flip side, he constantly seeks advice and guidance from people he respects. Fortunately, he ended up at the school that leaned much more advice if you want it than strict guidelines on how and when to study and sleep. In retrospect, I suspect a school with mandatory study hall and room checks (for example) might have driven him crazy. OTOH, there were kids in his class who would definitely have benefited from a more hands-one, rules-based approach, especially the first two years.