Advice on my A Level subjects for Physics/Maths at university...?

Hey, i'm currently in year 12 with subjects: Physics, Maths, Chemistry and Biology. I get my results in august for my AS results, and i'm currently predicted something along the lines of four A's or three A's and a B.

I was wondering if anyone could give me advice on what subjects I should take/drop to give me an advantage when applying for physics at universities.

My maths teacher is offering to do further maths for my class next year when I am in year 13, so I will receive an AS level in further maths.

Should I drop biology and take further maths? Or don't take further maths and keep biology as an A level. So my results would be along the lines of:

AAAaa or

or AAAA (optimistically speaking).

Would it be better to have an AS level in further maths AND an AS level in biology if I wanted to take physics or maths at university? Or should I stick to my four subjects, because if I don't take that option, I will be sticking with all my subjects.

So I basically want to know if two AS levels is really worth it, even if one is further maths, compared to having 4 A levels?

Thank you for your time!