Remember, its a study on legato, more than speed - when practising it, I would slow it down slightly, and make sure that your left hand legato is up to scratch. As for speed, you should play until you start to get tired, then stop, wait for the 'tiredness' to go, then try again. Do it a few times a day, and you'll see improvement.Heh, are you taking a diploma at the Royal College of Music? I would love to in a couple of years (when I'm 18) but I want to get the academic stuff out the way first.