Approach the instructor and ask him/her what you are expected to play at the audition. He/she will either hand you some sheet music or tell you what to bring.
When I was in high school I was told that I would have to play five tunes, all different styles, e.g. rock, blues, swing, latin, etc.
Also, I had to supply the sheet music myself.
Not all instructors work this way,though. Chances are they will provide you with music.
Who was Jaco? The only thing that I can say is you'll have to discover that for yourself.
Go and purchase his first solo album entitled " Jaco Pastorius ". You'll find it in the Jazz section. Give this a serious listening to and you'll have your answer my friend!!
Anyway, good luck with the audition!! And remember the most important rule: RELAX!
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Far out,man.