If a student's accommodations have changed or they no longer qualify for accommodations, you can edit the student's list of accommodations by going to the Student Lists area of the Report Center and opening the Students w/Accommodations report.
You can click the edit icon to edit or delete accommodations for those students who show as having accommodations. If you do not see the name of the student who needs editing, then click the Add Accommodations for Other Students link at the bottom of the page and search for the student on the resulting page as they may not be requesting accommodations this year but still have a previous year's accommodations showing in Total Registration.