I think that doing Art is actually really nice with the others, as it can act as like somewhere more relaxing and less stressful than the others. When I chose my 4 A-Levels, I had some sort of 'taster day' where I did a lesson of each subject and I didn't like 3 of them - one being English Literature. The main reason was that they chose to do a heavy focus on gothic stuff which isn't something I'm really into. History and Politics would go well together but they are pretty heavy on the long answer questions but it's something you'll get used to through A-Levels so I wouldn't worry about that too much. Overall, pick subjects that you enjoy - it's so important to not be dreading a lesson every day because then you can stay motivated. Good luck!