I done the exact same subjects as you in high school last year (but with shitty ranks) but managed to pull a 98.2, so don't worry... theres no point. Currently i'm doing Actuarial Studies with that ATAR having done standard english. You'll be fine :D The only thing that matters honestly is what...
I'd say catch up with 4u Maths ~ cause its heaps rewarding in the end.
You just have to know the right questions to do so you won't end up wasting all of your time on it, and thus you can catch up faster.
If you don't want to study med/ pharmacy in uni then drop chem.
Maths may be useless...