I work the auditions for the regional band auditions in middle Tennessee. (Midstate) The exercises we choose are extremely challenging. They have to be, because some of these kids are crazy good. If you don't have music that is sufficiently challenging, you can't sort them out. We use one lyrical piece and one technical piece. And of course scales and sight reading. We don't audition the kids for All State. We just take the top kids from each district. But I recall that in Missouri, the kids who made All District got the privilege to audition for All State. You really have to have challenging music to sort that out.
My daughter made Midstate Band, Governor's School for the Arts, and All State Band. They were absolutely fantastic experiences for her. She got to play with other outstanding student musicians and spend 5 weeks living as a music major in college the summer of her junior year in high school. She made a lot of good friends, grew up a bit, and met people who helped her out along her way. If you have the chance, playing in these groups is a great experience.