I thematically go through each of the modules and I have made myself a case study booklet which I look over once a day and try to learn a new fact or two. Then maybe just draw some diagrams of the key processes e.g. coastal erosion, how volcanoes work and go through some past papers. Also, do some mind maps for the impacts of geographical events e.g. if the coasts erode, what will the impacts be - people lose their homes, beaches are destroyed so less tourism, etc.
Hope this helps (somewhat)!
Ellie