QUOTE(clarinetkitteh @ Sep 19 2009, 06:36 PM)

My hands are officially "too small". I cannot reach a 10th and never will: to get a 9th my hand is already at the "straightline" stage, and I need to come off the keys and use the edge to get a clean 9th because there is no vertical space under my hand. Grade 7 pieces were ok, there was only the occasional 10th which I could spread. I'm currently working on grade 8, and the 10th-density is a bit depressing. I want to play the Piazzola from the grade 8 book, and spreading almost every chord is... Tricky.
Any advice? Is it possible to carry on with piano having to spread every 10th? Should I be scouring the grade 8 pieces for 10th-lite pieces? Should I be working on spreading 10ths neatly and cleanly and very VERY quickly, just so I can aim for the "hard" pieces?
It is true that those of us that can stretch a 10th or more don't have to work as hard at some keyboard skills as do those with smaller hands. And if someone is already adult, has flexible, extensible hands, and still cannot stretch even an octave, then that probably is a physical barrier to ever being able to play huge chunks of the piano repertoire. Perhaps they could be more successful on a different instrument.
But you can stretch a ninth, which means that octaves are not too much of a stretch. So no barrier to becoming a very, very good pianist. Ashkenazy had relatively small hands, and Godowsky is said to have had small hands too. I have read that neither of them could stretch a 10th - yet despite that they rank amongst the best pianists of the 20th century.
On your second question: Yes you are probably better off avoiding the Piazolla pice for your exam. Why start off by handicapping yourself. Why choose a piece that exposes a weakness, rather than playing to your strengths. Apart from the piece itself, any nervousness or lack of confidence you have about it will affect the rest of your exam.