Actually, since this was done without either Peter or Sarah's being notified, after they had already been approved for their chosen classes, they could challenge and demand that the College honor the original scheduling that had been set up.
Peter has to be able to service his scholarship by playing baseball (or whatever); or he won't have a second semester (or quarter or whatever)to worry about.
Sarah needs to be in Pre-Vet classes, or she might as well stay home, insofar as her movement to actual veteranary science is concerned.
If she's on scholarship as well, not taking the necessary classes will see her out by the second semester, too.
At least Peter and Sarah will be together in being dropped.
Jack didn't think this through very well: Sarah will find out why her schedule has been trashed, and by whom it was trashed as well. She will eventually gain control of her Wuffy side, and then Jack is going to have to 'splain why to a very annoyed eleven-foot plus Werwewolf.
I wouldn't want to be Jack at that point. Not at all.