Your teacher should have recommended you a solo piece,but since it sounds like you don't have one, and you haven't been practicing, and you need something you can work up in a month
My suggestion is to keep it simple, don't try to play above your level or you will sound like - well, not good...
The Vivaldi sonatas are nice, also the Marcello sonatas. You could work one of those up pretty quick. Or why not just do a nice etude? The Storch ones are pretty nice, I also like the Bille.
The simandle ones are not very musical, but doable. Here is a link to some with piano accompaniment.
http://www.billbentgen.com/music/etudes.htm
Good luck and work hard!