Help with choosing a music piece?

So I need an audition piece for a prestigious band camp. They make you audition and do a few scales. But when you audition they either put you in a really good group (playing level) or really okay group. I want to make it into the top group so I can put it on my college Portfolio. I play flute have been for about 5 years or so, had a few solos. I have done jazz with my flute and also do guitar. Right now in my folder I have 2 jazz songs 20 carols in 2 minutes(from x-mas) Pink Lemon aid(a faster march style song with high notes) Renaissance revel (Greatest dance hits from the 1550s speed varies) Trolls (a song that speaks for itself, very off sounding lots of breaks best in duet with flute 2) and a few other old and really slow ones. Should I choose from there or see if I can look through my band teachers VERY big collection (like 3 book selfs floor to roof full!) Help please and thanks you