Needless to say I play clarinet, and I've been checking out free online solos on short notice. I have an audition coming up that calls for a piece (I'm in the 11th grade, HS), so I've been considering these -- any advice or recommendations? Thank you.

Divertimento II - Mozart
Four Pieces for Solo Clarinet - Andrades
Ocean Grayness - Czaplowski
22 Pieces for Solo Clarinet, Bach

If you can play Mozart and Bach then just go with them. They're famous for a reason.
If you want to be different then surprise your audience with less known composers.