Re: solo or Jazz
solo and ensemble is a weekend thing you prepare a solo for correct?
Many students I teach do both actually. They just have to be efficient in their practice time. Part of the time on the solo(and make you take it to your lessons for advice from your teacher, it helps!!) also make sure you spend time going over parts in the jazz music, so you can put them together with the band at practice. Same for concert band music.
Lastly, I always tell my students when they dont think they can do it: I did it, so can they. I know others that did it when I was in school, and I have students that do it now. Its all just gonna go down to your practice efficiency.