One of my kids applied to eleven schools, trying to land a big merit scholarship, and it was so much work.
I think if you do some research now, most schools will still have this year’s prescreen and audition requirements up on their websites and you can get an idea of what will be expected for next year based on that. As you likely already know, it will help to have repertoire practiced and prepared well ahead of time to fit all the requirements. Although I seem to recall that if you have an art song in English and Italian you’ll be on the right track for voice. My son also auditioned on cello so we were tracking two sets of audition requirements for each school.