answer:I think it probably depends on the person. I’ve never tried “sleeping on it”, and always just go through my notes a few more times before the day of the exam but… Personally, if it’s something I’ve not started revising for yet I often find myself losing what I revised for in the other subject because my brain says “Oh, new stuff! Must be more important than that stuff from before. Better make room for it I guess…”. Otherwise (if it’s something I’ve gone over already/at the same time as the other subject) it’s usually okay and I’ll remember most of it :s