I was going to rollover laughing, but I think it should take some serious note.
ACCA doesn't require you to have a degree in order to do it. See the following:
https://www.accaglobal.com/uk/en/qualifications/glance/acca/minimum-entrance.htmlHowever, it doesn't seem they accept T-Levels.
Accounting isn't really a very quantitative subject, so A Level Maths isn't necessary. What is typically necessary is 3 good A Levels in any subject (or equivalent). Finance on the other hand can sometimes ask for A Level Maths because they have quantitative content that requires you to have maths at that level of proficiency. The Finance joint degrees isn't necessary should you wish to go into accounting.
I don't know which specific unis you intend to do your degrees in (there are hundreds in the country), so it's probably better to start with the entry requirements for those unis first.
If they require you to have A Level Maths, then you could study it as a private candidate (a complete pain, but viable). However, this is substantially more difficult than GCSE Maths though.
As you have mentioned that you don't have a B in GCSE Maths and you're 17, I would want to confirm which country you're based in
Do also note, why ACCA as opposed to ACA, ICAS, CAI, AIA, CIMA, CIPFA, etc.?
Is it chartered accountancy that you are set to do as opposed to public finance, management accountancy, etc.?
Even if all is lost and you fail in all respect (including getting into uni), have you considered doing the AAT Level 3 qualification to gain entry into ACCA? Typically, there is no entry requirement and it's usually the preferred route for accounting apprentices.
I don't know enough about your situation to comment, so unless I am clearer about the above then it's difficult to advise.