yeah this is such a good idea, but the problem is, attendance and punctuality apparently will be going on UCAS so I can't let that suffer and apparently some universities have requested for some students attendance upcoming to exams ( mostly oxford and cambridge though)
but definitely an hour of my own work is like 2 days of schools so working from home is so much better, but near exams its common teachers might mention tips or advice which could be really useful and you miss out on. Perhaps when everyone else does mindmaps you sit in the class and do your own revision- i often do that and the teacher doesn't care, as long as I'm working. Frees perhaps go to the library if its a distraction in classroom/common room. I often find an empty classroom and sit their and work.
Some students at my school do this regularly round exams and now its a bad habit they can't get out of, which won't help them at all for uni when you still have to attend lectures just before your exams.