I'm doing triple science and to be honest, there's little maths involved, except for a topic or two in Biology, some calculations in Chemistry, but Maths in Physics is a lot more, but not difficult at all; it just takes a bit of getting used to.
The pace in triple science (or so I've experienced), is that it's very fast-paced and requires revision out of school if you don't understand a topic fully.
I have trouble with Maths also, but I'd say I'm doing okay with triple- it's just about keeping up with topics etc.