When it comes to math, all you can do is practise, and practise. Meaning, do not waste your time making revision notes-- rather invest that time in doing as many questions as possible.
However, I know that is a generic advice and one that you are most likely not looking for.
That said, I suggest investing time on grabbing the easy five mark questions. Look for the five mark questions to begin with, and spend time in doing them to increase your mark capacity; many often only score 3-4 due to not paying attention or spending enough time on it.