I've got a question about practicing advice. I have always had a bit of problem staying at a good tempo while practicing fast pieces. In order to repair this quickly, my teacher is having me practice the first characteristic Arban study with a metronome. My only problem is: I only stay with the tempo for about one line then I get off by a beat or so. I am taking it at a slow 69 bpm to make sure I get the timing right, but I still have trouble with it. Anyone have advice or overcome similar problems?