Hey RuskiBrah,
Ultimately, I don't think you should be making choices purely based on scaling. I have friends who picked all high scaling subjects and ended up miserable because they didn't actually enjoy the content, which led to them burning out quite frequently.
I think you should make a decision purely based off your workload and enjoyment. Look ahead in your syllabus, and see what sort of content you'll be studying next and whether it'll be enjoyable or useful to you in future.
You said that you'd like to do business/finance in future, so business studies and economics should naturally be more relevant. In terms of maths, universities do offer bridging course so it's not the end of the world if you drop. Maybe chat to your maths teacher about your performance? You could consider dropping down to standard, which might ease your workload.There's a lot of things to take into consideration here, but ultimately you're the one most qualified to decide.
Best of luck, whatever you chose to do!