A level choices help

I wanted to do medicine for uni and because of that i thought of
bio chem maths and possibly further maths as my a level options.

unfortunately my school doesnt do AS levels so i cant even drop a subject if i take four and think its too tough...

i also read that apparently you only need chem and can do any other two sciences for medicine...


would any of you guys recommend all three sciences bio chem and physics or would that cause too much pressure????