Can i pass the ACA without a degree and just grade 5 gcse maths?

The scheme will be designed for school leavers and they wouldn't be likely to accept you if they didn't think you could reasonably complete it. In any event you just need to make sure you prepare well for the professional exams and if you identify you need help early, make a point of organising that support.
I doubt there's "complicated maths" involved in accountancy - my understanding is it doesn't involve anything really beyond GCSE (no calculus or anything for example). Just lots of basic arithmetic (handled by spreadsheet) plus some stats and percentages and basic understanding of series (i.e. compounding). I know someone who went into a big 4 accountancy scheme with a degree in history and politics who didn't do any maths after school other than some very basic descriptive statistics (i.e. GCSE level) in their degree. Equally I know someone else who went into accountancy after doing an engineering degree and they said they were relentlessly bored by it because there wasn't anything interesting or sophisticated involved in the maths...
Obviously professional exams can involve a bit more than you're likely to come across in the day to day work of your job, but you can find out what is involved in this and should be preparing for it anyway as above. So you'll have time to see what there is and make sure you get support if needed (e.g. finding a tutor if necessary or similar).

That’s put me at ease. I think I will just prepare with the basics before I start and organise. Thanks for this information

Also remember you'll be working with people who have done those exams and they can provide some insight (particularly those who have done them recently in the last couple of years) on what kind of things to focus on and if there are any good resources to use. So make use of the networks you'll develop in the role too!