Being proactive is the way to be! I did the same thing last year. Its pretty helpful to get familiar with the AADSAS app before actually filling it out. I filled out a "practice" app and saved everything on a word doc for this year. So when the real app came around, I copy and pasted, adjusted and was done much more quickly than if I had to come up with everything on the spot. It didn't affect my app at all this year since the old app became inactive about a month before this years app was opened.