make exam URLs consistent
make exam URLs consistent

benjaoming/kolibri,christianmemije/kolibri,DXCanas/kolibri,mrpau/kolibri,learningequality/kolibri,mrpau/kolibri,jonboiser/kolibri,lyw07/kolibri,learningequality/kolibri,jonboiser/kolibri,benjaoming/kolibri,learningequality/kolibri,lyw07/kolibri,indirectlylit/kolibri,jonboiser/kolibri,DXCanas/kolibri,christianmemije/kolibri,indirectlylit/kolibri,DXCanas/kolibri,DXCanas/kolibri,indirectlylit/kolibri,mrpau/kolibri,christianmemije/kolibri,mrpau/kolibri,lyw07/kolibri,benjaoming/kolibri,benjaoming/kolibri,christianmemije/kolibri,learningequality/kolibri,lyw07/kolibri,jonboiser/kolibri,indirectlylit/kolibri