I don't know what my other pieces will be yet either, actually. I was starting by picking my classical piece as it is worth the most percentage of my grade. The others will be a Baroque, Romantic, Early twentieth century, and late, and a concert etude which will probably be Romantic era. I will start preparing for this in June, and will hopefully do it a year and a half to two years later.
My teacher just called me, so I asked her about it. She said she thinks it's rather long, but will "think about it."

She always says that! Her exam took her 45 minutes. (I have maximum and hour, but not longer) She did the Moonlight sonata, but I think it's too overplayed to be a safe choice. What do you guys think?