Okay here is the most important tip for singing auditions:
Pick a song that isn’t a super famous song, but not one so unknown that the pianist won’t know how to play it.
Do you know how many times the panel has probably heard “On My Own” or “Mozart Was Crazy” in the last hour alone? So many times that there’s a good chance as soon as you hand over the sheet music they’re already thinking “nah”. Unless you’re 100% certain you can hit that song out of the ballpark in a way no one else has done today, don’t shoot yourself in the foot like that.
Honestly your best chance lies in a lesser-known song by a well-known composer. Pick one of Frank Wildhorn’s lesser known musicals. Pick a song from a musical choreographed by Bob Fosse. Pick one from a musical your parents will recognise the name of. DO NOT pick a musical that’s popular on Tumblr for the love of god.