Not sure about whether I picked the right level 3 subject

Context: I'm currently in year 12 and picked Double maths, computer science and an RS level in creative digital media (a coursework subject focusing on game dev) for my subjects. I'm very happy with the maths and comp sci side of things, and it's enough to go into computer science or maths I'm sure. The main problem is creative digital media, which I picked because I wanted to do something fun as my 4th A level (pretty idiotic to do but eh). It turns out that It's much more art focused than I though it would be, which is pretty anxiety inducing for me since I'm not an art guy. The subject I would have picked if I didn't would have been physics, which I think would have meshed with maths much better and given me much more STEM career and course pathways than creative digital media. It's not technically too late to change my course, however I assumedly would have a lot to catch up on since Its basically half a year through already, and I would also have wasted my progress in CDM.
Right now I'm thinking just to stick it out and aim for a D instead of a D* since I currently plan to study computer science and maybe some added maths (or joint CS + maths). If I were to apply for a prestigious Uni (like Cambridge or oxford), would having a non-stem subject as my fourth subject be detrimental to my chances?
My main question is, how hard would switching to physics be if I decided to/whether it would be advisable (could I self study it after sixth form maybe?). Additionally, if I wanted to change my course/career pathway to something more physics related in the future, how could I get the qualifications to do so?
Any thoughts would be appreciated.
Tldr: Picked a creative subject as my 4th a level which isn't as good as I though it would be. Considering switching to physics (though it would be pretty late) or studying physics later. Currently aiming to study comp sci and not sure how a creative subject impacts my chances. Would like advice or just thoughts

Hey, I filter SR for search terms like Game art/Game dev so my advice is not that of someone who went down the super academic route (but bear with me)
From my understanding, doing 4 A -levels is not necessary to get into the super prestigious universities- sometimes it can be a bonus, but not a necessity - focusing on doing really well in your Maths and Compsci should be enough - and I wouldn't worry too much about your other course impacting your outcomes. One of my best friends went to Cambridge with 3 A levels in amazing grades (I believe A*A*A*) so it definitely is not a dealbreaker.
If you are still interested in pursuing some kind of game development pathway in the future, possibly as an outcome from your maths/compsci degree in something like software engineering, feel free to reach out to me and chat further. But I appreciate you may want to move away from that if your intention is to broaden your career prospects (certainly not a bad thing!)

Context: I'm currently in year 12 and picked Double maths, computer science and an RS level in creative digital media (a coursework subject focusing on game dev) for my subjects. I'm very happy with the maths and comp sci side of things, and it's enough to go into computer science or maths I'm sure. The main problem is creative digital media, which I picked because I wanted to do something fun as my 4th A level (pretty idiotic to do but eh). It turns out that It's much more art focused than I though it would be, which is pretty anxiety inducing for me since I'm not an art guy. The subject I would have picked if I didn't would have been physics, which I think would have meshed with maths much better and given me much more STEM career and course pathways than creative digital media. It's not technically too late to change my course, however I assumedly would have a lot to catch up on since Its basically half a year through already, and I would also have wasted my progress in CDM.
Right now I'm thinking just to stick it out and aim for a D instead of a D* since I currently plan to study computer science and maybe some added maths (or joint CS + maths). If I were to apply for a prestigious Uni (like Cambridge or oxford), would having a non-stem subject as my fourth subject be detrimental to my chances?
My main question is, how hard would switching to physics be if I decided to/whether it would be advisable (could I self study it after sixth form maybe?). Additionally, if I wanted to change my course/career pathway to something more physics related in the future, how could I get the qualifications to do so?
Any thoughts would be appreciated.
Tldr: Picked a creative subject as my 4th a level which isn't as good as I though it would be. Considering switching to physics (though it would be pretty late) or studying physics later. Currently aiming to study comp sci and not sure how a creative subject impacts my chances. Would like advice or just thoughts