Our school has a policy where you are required to mark books once a week, leaving detailed feedback and action for the student to take to improve every other time. I often find myself getting bogged down as the term goes on with this. I am aware that if I disciplined myself better when I felt ill or shattered, I probably wouldn't... (!) I can't seem to justify "wasting time" by getting them to mark their own/peer mark in class, particularly as each group is required to work at three different levels (differentiation) which invariably leads to three different groups of questions being done, which means if I read out answers only a third of the class are participating. (This sounds really silly, actually, as I type it!) Does anyone else differentiate any other way in maths? I was wondering - does anybody mark books after every lesson, when there is very little to do, or do you wait a week and mark say 3 lessons together? I'm trying to decide which is more efficient?! Any help/advice/suggestions as to how I can keep sane with the marking/differentiation would be greatly appreciated.