Anxious year 12

hey everyone, I'm a year 12 student who just started their a levels. I'm doing biology, chemistry and psychology currently. I was doing Maths instead of psychology but dropped it because at the time I was feeling stressed and had a lot of self doubt in myself that I would not be able to do a level maths, as if be able to get a good grade. For context I got a 7 at GCSE maths and a 6 in further maths.
My question is that is there anyone who dropped a level maths and is regretting it or has regretted it? If so what did you do to cope?
Also my school is not letting me back into maths no matter what so that is out of the question.