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Further Maths A Level A*

I'm just looking to see how I'd get an A* in maths. For OCR Maths A Level you need to get an A (80%) overall and an average of 90% across C1 and C2?

But for further maths it says you need to get an A overall and 90% over "your best 3 A2 modules", but what counts as this after the maths A level has been taken into account?

I've already done AS: C1 C2, S1 for maths and FP1, D1, and M1 for further.

For A2 I am doing C3, C4, S2 for maths and FP3, D2, and M2 for further (although the S2, D2 and M2 can switch depending on how well I do?)

But it says "best 3 A2 modules" but aren't I only doing 3 further maths modules? So I need to get an average of 90% in everything?