Methods and spec overlap considerabily with calculus, Ie skills learnt in methods are used in spec and vice versa, which hopefully means the kids in spec will get a lot more practice with calculus and should become really good at it.
There is a bit of kinematics, projectile motion etc at the end of spec, but it is far more math based and moves into things like non constant acceleration which is not really touched on in physics. However the concepts are still the same ie you have to understand newtons laws etc. Which, if your doing physics you should probably know.
I'm finding chem and bio overlap quite a bit as well in unit 3. stuff about DNA, proteins etc bio students learn as well.