For AS I did psychology, sociology, biology and photography. I dropped photography though and am only going to do the other three as full a levels. I would recommend doing sociology and psychology as I find them both interesting. I find some parts of sociology are a bit hard if you don't find that particularly interesting but the majority of it is very interesting. I would recommend it over photography as doing it as an AS honestly took the enjoyment out of it for me, as I was taking photos because I had to, not really because I was feeling inspired or enjoyed it. I find sociology, psychology and biology very interesting especially together as they interact, especially sociology and psychology and even though they are hard, it isn't so bad putting in the effort if you enjoy it. So yes my advice is to keep photography as a hobby so that you still enjoy it haha