In that case, K. 576 is the (second to K. 533) worst choice you could possibly make. It is considered the most difficult and advanced of Mozart's sonatas (although I personally find K. 533 more daunting in all regards). It is a particularly poor idea if you have very minimal time to prepare it. I find it dubious that your teacher would make such a recommendation.
This wouldn't happen to be for the Cleveland competition, would it? If it is, or a competition with similar programming requirements, i.e. short rounds with very specific repertoire, I would suggest against it even more strongly. For someone who does not have a lot of experience or interest in Mozart, I would not suggest the comparatively long K. 576, which will occupy a decent portion of one of your rounds. I only ask if it is Cleveland because they require Mozart or Beethoven and oddly do not permit Schubert, similar to your post.