Tbh, I was a bit sad when I was at school, but I made revision my absolute priority for the months running up to my exams, and did a couple of hours a night in the earlier months in the year. The way I thought of it was that I would get the best part of 3 months off school once I'd finished, and films, books, games etc would all be waiting for me. I got good results, so I was glad I did it that way, and I continued like that through all of my studying, right up to finishing my degree.