QUOTE(arabesque @ Jun 20 2006, 06:58 PM)

WOW You are only grade 3 and yet you are doing an hour a day -
Ditto.

That shows fantastic committment!
I only started practising like this when I was working for my grade 8. I'd play a 'nice' piece to warm up, then do some scales; sightreading; more scales and maybe a piece or two. But I used to break it up into smaller sessions as I rarely had time to just sit for an hour or two to play due to school and other commitments.
Having a set routine really helps in preparing for an exam. As long as you feel you are improving and still enjoy playing, that looks about right to me!!