Ian appears in Pilot, helping Tori with a project for Science. After Tori's incredible performance at the Big Showcase however, she accepts Principal Eikner's offer to attend Hollywood Arts, leaving Sherwood.
The school is first named in Cat's New Boyfriend where it is revealed that Tori dated Daniel during her time there. Sherwood later had a half-day in the episode which Daniel used to visit Hollywood Arts.
There is a real Sherwood High School in Sherwood, Oregon.