The DfE has determined which sports are allowed for GCSE and for A Level. The list of sports is final and the only exception is for disability:
AS and A level is coaching or performance
All skills criteria are contained within the guide to NEA. All activities are broken down into three parts – core skills, advanced skills and decision making.
All activities are marked using the one grid – found in section 2b.3 of the GCE guide to NEA
Coaching is marked using the grid in section 2c.1 of the GCE A Level guide to NEA. (Coaching is not available as an option for GCSE).
The list of allowed sports is prescribed by the DfE and is the same for all awarding bodies.