if you have been understanding maths in class theres no need to study really, as it will be a lot easier. id dedicate most study to hist/geog, maybe look over some formulas, or go over your trial and identify any area you dont understand.
For me, i lost 6 marks in trials on one question because i just hadn't looked at coordinate geometry formulas for a few months, thus forgot them.
so yeah, just reaquaint yourself with everything, look over your trial and you should be fine fine fine fine fine!
It's only the SC so it doesn't really matter. But, if you do struggle with some topics in class, I think you should go through your text book and work through examples of those problem areas.
I always have been a night-before the due date person myself, that's all I ever needed, if I studied at all.