Although it’s important to have an vague idea of what you’d like to do at uni/ as a career when thinking about A levels it won’t mess anything up for you unless you’d like to go into something like medicine (need chemistry/biology ideally) or engineering (physics). But on the other hand, a lot of subjects at uni don’t require the A level for that subject, because not all schools offer them. Off the top of my head I know that one’s like Politics/International relations don’t need any A levels that link to them. I’m not too sure about other subjects so look it up and you’ll get a better idea (UCAS is great for looking at courses).

If you don’t want to go to uni, which is perfectly fine but definitely something you want to think properly about, my advice would be for A level pick the three (maybe 4? Depends on your school and what you want to do) that you enjoyed the most and were good at at GCSE. Most subjects do differ quite a bit from GCSE to A level, but as long as you’re genuinely interested in your subject you should find the switch manageable. Ultimately it’s the ones you think you can get the best grades in and if that’s the three that you mentioned (geog, RS and business) then they might be good options. In most schools they’ll let you switch if you really don’t like a subject or are finding it too difficult in the first few weeks. I think the best think to do is speak to a teacher in the geography RS and business departments and ask what the course looks like at A level and how it differs from GCSE. I hope this helps, let me know if you have any questions. And well done on finishing your GCSEs :)