I would go with what most people are saying and drop physics. I too do biology, chemistry, physics and maths and I kept all four on till A2 - but if I had dropped one, it would have been physics. Maths is generally considered to be easier by people who study it, but often more respected, just because most people think it's difficult. If you're finding the lessons boring I assume you don't find it too challenging?
Alternately you could try keeping all four on for the first term or something, or at least wait until you get your results and drop one based on that.