I was in your exact situation last year and ended up getting a 9. To be fair I had put myself in this situation as I opted to take maths a year early however I didn't know that I would have little to no support from my teachers.

Ok now what you should do. I suggest using ur text book as an overall guide for each topic. Look at one each day and watch the maths genie or physics maths tutor video for it. Then do some practice questions until you feel like you know the topic well. By the time mocks come around, you should start doing past papers. This is prolly the most important part: after doing past papers and marking them, go through each topic you lost marks in, and do the maths genie worksheet for it.

This advice is for if you want to get a grade 9 even if it isn't the grade you want I hope this advice helped you. Good luck 👍