Reaudition advice

I recently got denied for my college's school of music for the fall semester, I'm still going to attend and reaudition this fall for the spring semester. Is there anything I can do to give me a better chance the second time around. Obviously I know to practice my audion pieces and fundamentals and such but once I graduate high school I won't have a band class and it's iffy if I can take lessons, and not having a teacher while I prepare for my reaudition worries me.