A Level Maths: Mechanics or statistics?

C1-4, M1, S1 has to be one of the more common routes for straight maths. It's definitely allowed

Thanks for that! But if I were to choose one of the two, which one would you recommend given what I said previously.

At the moment, I dont really know but it will be a social science.
That im sure of.

If I were doing straight maths, I'd choose two of M1, S1, D1 because A-level Further Mathematicians take S2/M2 and no matter how hard the paper is the boundaries are always high (think 65/75 for an A). That being said, S2 is pretty straightforward and as is S1. M1/M2 take a bit of practice to get right

What exam board would your Maths A-level be with?

I don't think it'd make a huge difference in the long run, if you can't pick both S1 and M1 then.. maybe S1 is the way to go if you're not that confident on Physics (unless the Maths element of GCSE Physics was fine and theory was letting you down).