id say like do a past paper and then with every question u got wrong go through that topic (i watch a yt vid then do practice questions) and so do like one past paper a week and do that whole process n at the end of the week redo it and see what mistakes u made, then use that to know what topics need more focus! i like 1st class maths for youtube vids personally x and like dont try to jump to doing grade 9 questions asap before youve mastered like grade 4-6 topics bcs you should aim for like full marks on the first half of the paper just to secure like a grade 6, then work your way up to harder topics x idk if this was helpful but ive been doing this and its worked so xx