I do IGSCE and I scored 9 too and scored an 8 in further pure math A Levels so I think I'm good at math and with maths revision is not really required. Why? because we r talking about a skill here u believe math is completely a skill and once u understand a certain part then you can answers it even without knowing the formula and once u understand something it sticks to yr head so you will never have to revise unless u just go through formulas and you can do this by listing a topic and write all formulas u know under this and then write another topic and list all formulas again...when exams approach just read this paper and I'm sure u won't have to revise it instead just read and it sticks to your head.... I never revise for maths but sometimes I just look at formulas they have and read them and a tip is when u see a question that u can do try the basic stuff u know when this fail to answer then try to think out of the box.....sometimes u think out of box and then the answer just lies in the basics. I have this problem alot in maths since I do pure maths, so when I'm doing a math paper I tend to over think leading to answers which r correct but not required by the examiner but overall if u r good at math u wont need to revise maybe just read😊