honestly, maths is so important if you want to do a degree in finance areas, more so than econ itself (in terms of getting in maybe not necessarily content). most unis would require maths, and even only have econ/business as a suggested subject bc they know not. a lot of schools offer it as an a level. also imo you kind of make your econ a level redundant by not taking maths in it (that is if you want to go into finance or something)
anyway bottom line, yes take maths w econ, it’s vertically non negotiable. hope this helps!