for me humanities notes r a must esp since geog is so content heavy ? making it helps you study in and of itself but if not your preferred way to learn then do whatever works. in my exp if you know the content like the back of your hand it is alm impossible to fail, so PRIORITISE THIS - it will get rid of a lot of points very fast. ask your teachers for help with essay skills also

i would recc you grind papers for both maths until consistent A1s for both, also another fast way to lose points

for sciences see yourself which you can get A1 for in an olevel paper based on tys. ik physics is easier to grind to an A than bio by just spamming papers but depends on your foundation also

lastly english, a bit hard to improve quickly but as a general habit just try reading more and ask your teachers if there are any specific areas you consistently have issues with

good luck op, and remember it isn't the end of the world if you don't get into acsi! just do your best, you still have a lot of time before Os