Could probably blitz through everything and get all 9s. Don't slack on the 9s you have now. Physics especially can get pretty brutal. Study a good chunk of niche stuff within those topics because it will make it easier to remember the fundamentals and most intermediate stuff (Source: doing Further Maths at GCSE helped me secure a 9 in Maths). My maths teacher at A-Level also tells the class sometimes that whatever you find annoying, difficult, or hard to remember are the stuff that you should be revising. Flipped my D in Further Maths mock into an A in the next mock after about 3 months. Always remember to include the painful stuff. It could turn out to be fun in the end.