Ditch Art and do the sciences and Maths.
I'm doing Maths, Further Maths, Physics and History.
I don't find either Maths or Physics hard. Although, maths comes easier to me because I'm doing FM and I've already covered more than I need to know in Maths.
Although, from my classmates, I can tell that they find Maths harder than physics.
I wouldn't advise doing physics without maths. Hardly anyone does that, and those that do tend to do worse.