You wouldn't need maths for anthropology and/or law.
For biology it's not essential although bear in mind any science degree including life sciences degrees are necessarily mathematical to a point so you do need to be happy to spend 3-4 years of your degree doing a fair bit of numerate work involving at least minimally stats and related topics in any science degree.
However there are plenty of degrees involving scientific concepts that don't necessarily rely on scientific methodology which inherently involves mathematical elements. For example anthropology, archaeology, linguistics, history and/or philosophy of science, science and technology policy/studies, etc. These may be a better fit for your strengths and interests potentially if you aren't so keen on maths!
Taking chemistry when you aren't keen on it either is probably not a much better option though. Since you only need 3 A-levels I'd suggest just sticking with your first three choices if you're enjoy those and are confident in them.