Oxbridge med

Hey everyone,
Just wondering if I even have a shot at Oxbridge (mainly Oxford) or any top London unis like kcl,ucl,imperial,etc with my GCSEs. I got 9988888888 (9s in Chemistry and RE). I’m currently doing Biology, Chemistry, Maths and Psychology at A-level in Year 12.
I’m hoping to study medicine at uni, but I’m a bit worried my GCSEs might hold me back. I know the GMC sees all medical schools as basically the same, but I’d like to get into a top uni more for personal satisfaction and the experience.
Let’s say I have good predicted grades and a strong UCAT (eg like A*A*A*A), how much would my GCSEs honestly affect my application? Would it be worth resitting Maths and Biology GCSE to try for a grade 9?(or is it better to do a medical related undergrad course like biomedical science and then postgrad medicine?)
Any thoughts would be super helpful
(Btw I’m from a very poor borough, from ethnic minority, I received free school meal, I’m eligible for 16-19 bursary, ill be the first in my family to attend uni, my secoundary school gcse grade average was about 6.8 and mine is 8.2)

10 A* GCSEs is okay but average for oxford. aim for a ucat score of at least 2200, though the average for shortlisted candidates this year was 2400-ish. good predicted grades only really matter post interview when they're deciding who to waitlist/offer places to/reject in january so they aren't as relevant in terms of just getting an interview (the most important part). i say this because oxford only interview 30-ish percent of their medicine applicants versus cambridge who often interview around double that (~70).
hope this helps!