didn't get the gcse grades for two of the a-levels i wanted to do - what now lol

at the sixth form i am going to you need 6,6 in combined science to do a science a-level. i was going to do physics and biology (+ maths) because these were my absolute fav subjects. the only thing that made my grades suffer was chemistry. anyway i got a 6,5. so now i cant do either of my two fav subjects and i need to pick two more. i've always been more into maths and science so it's so hard to pick because i need to choose two subjects that aren't maths or science.

at the sixth form i am going to you need 6,6 in combined science to do a science a-level. i was going to do physics and biology (+ maths) because these were my absolute fav subjects. the only thing that made my grades suffer was chemistry. anyway i got a 6,5. so now i cant do either of my two fav subjects and i need to pick two more. i've always been more into maths and science so it's so hard to pick because i need to choose two subjects that aren't maths or science.

Surely with it only being one grade lower than the requirements they could give you some consideration and let you do the subjects still.
Ask the sixth form if it's possible you can do the subjects, and if the teachers feel like that you aren't prepared for the subject then you'll change courses. Granted, you'll need to put a lot of effort in to ensure you can stay on the course. Dedication, revision and effort are vital.
If not, are there no other sixth forms or colleges in your area you could attend that would let you onto their courses? Is it really worth attending a sixth form if you're not going to enjoy the subjects? A-levels are hard enough, but I can imagine it'd be even harder if you dislike the subjects you take.