You need to create a custom graph use school tier graph then Venn it with yr 12 and 13 the school tier without yr 12 and 13 memberships are yr 7 to 11 save as custom group and now can be used to filter on 7 to 11 only job done
You need permission to the root of the c drive or you can set up a folder on a shared drive and have the pdoxusrfile in there in idapi setting change so that it points to shared folder its in the fms manual