Your grades are really good, but 4 a-levels is definitely a huge workload. My brother did 4 including maths and further maths, and he ended up quitting further maths after a year because it was too overwhelming doing 4, and his grades were also really really good. Obviously, if you don't meet the grade requirement you won't be able to do it, but I think you should think about whether you want that much work, rather than just whether your grades are good enough.