It is good to balance if you are not too sure. So stick with the Maths and Eng. Lit. Does History take your fancy? It is great for your analytical skills and is a really interesting course. I really enjoy Chemsitry and it is pleasantly easier than I thought. Just make sure you don't go down an all sciences route etc. as it limits your options and you will be bored of using identical skills.
I am studying: Art, Chemistry, Maths, History, and AS Italian. I have had positive feedback for my range.
Good luck!