The policy of www.johndclare.net on games is that they are good every now and again as a 'pressure release', but that they are not very good as a learning vehicle, and that they convey next to no information into your brain.
No pupil will ever pass GCSE by only playing games - the time comes when you have to sit down and understand and LEARN the info.
site is a GCSE information site - it gives you GCSE information/
exemplar essays/ revision sheets/ links/ a revision forum/ exam advice
etc. Other sites do games MUCH better than I ever could.