The Studies in Copper collection and the Musical Etudes by Fink are great repertoire for college auditions.

Mean Man Matt from the rudimental cookbook is considered the easiest class 1. The Blue Book is full of good stuff.

Concert snare etudes that are impressive for college would be the Tompkins French American Rudimental solos and the Keith Aleo advanced Etudes.

These are all on the PML. If you're not tied to the PML, there are other suggestions.