Need to choose some Classical Piano pieces for next school year, help please?

I think the Chopin etude has been exhausted. Pianists all over the world add this piece to their repertoire, and while that may be a reason to do the same, I think you should go with the scherzo. It is not as familiar, so you won't be under as much pressure to play it perfectly. Of course, you want to play it perfectly, but if you hit a wrong note or two, it won't be as obvious, because it is not as popular as the etude. It might also be a tad bit more challenging, which is always a good thing.

Also, go with the Shostakovich. You can never go wrong with Shostakovich. It will be a more interesting piece, for both you and the orchestra.

Ha! Wow, the Etude and the Scherzo are two totally different pieces...the Etude is not a program piece, most pianists would perform the enitre Op 10 or 25 (or both!), maybe an encore. I don't think there's a question here, IMO, the Scherzo is an extremely fun and rewarding work, go for it! I think it could be good if you did a French Suite or something, to add contrast in your program, just an option! :)

Very nice. How about Rachmaninoff Prelude in G minor. Op 23 no 5 i think. Black keys etude for chopin. winter wind, revolutionary etude. be back with more eventually. I suspect you already know some of these though.

Shostakovich all the way. For sure. 100%. Definitely. Unquestionably. Indubitably. Unmistakably. Mkay? Mkay.

I like the Shostakovitch's choice. If you haven't already played it (and judging by your repertoire I think you might have) try Chopin's Fantaisie Impromptu. You could try some Rachmaninoff, I think you might be ready for him!