maybe the c minor prelude and fugue, from Wtk 1? It's not that difficult, and that's the most ppl start with. And well, you've got the sonata, just do the 1st and 3rd mov from pathetique. Though, no offence, I'm quite concerned about your current repertoire. 2nd mov from pathetique and Clair de lune isn't relly university repertoire. What else do you play?