Computer Science at Uni Path

I have been stuck on this for a while. I am homeschooled and I will be doing GCSE's at a college. The college only offers 4 GCSE's so I will have to self teach myself another subject and then find an exam centre. I was thinking of RE as that is very easy for me or Computer Science as I would like to do Computers at Uni, Software Engineering or Computer Science. But I think RE will be way more easier to self teach than Computer Science so I am not sure which one I should pick.
Also for A-levels. I am stuck on what college to go to. If I go to the College that I will do my GCSE's at they dont offer Further maths, economics or Computer Science. But they do offer maths, physics, business studies, chemistry, biology, psychology and more. And I think that I wont even have to do a self taught GCSE. So if I were to continue to go to college 1 which subjects would be best for Computer Science at University?
This College is also closer to me and the city and offers good financial aid. The term ends in June.
For college 2 they offer a lot of A-levels since it is a sixth form college. So if I were to go there I would probably do Maths, Physics and Computer Science. But this college is over an hour away on public transport and is further away from the city. The college also ends in July. Which threw me off a bit. Also the financial aid isn't as good as the first one.
I also will not be going to a uni in the UK. I was thinking a Uni in France as that is where I am from, or Japan as I am learning Japanese.
Which College should I pick 1 or 2? And which A-levels if I pick 1? And Computer Science or RE for the self taught GCSE? Thank you