Actually it was filmed at Glenbard North in Glen Ellyn, not Glenbrook North. (Those schools are so easy to mix up!) It followed the class of 1991, but only a few episodes aired. It was ahead of its time and if it was made today it would probably be a hit.
One of the girls on that show, Kelly Ruff (she was the homecoming queen), was on my dorm floor at IU the following school year.