I would strongly advice two things, first do not take the DAT until you are ready to take it, and two do not wait until August to submit your application. On August 31 2007, AADSAS already received 7400 applications, if you submit your application August 1st and it takes the minimal four weeks to process schools will not even have it in their possession until after Labor Day and you will like be buried under 800 other applications and weeks away from review, this scenario is not that bad and puts you right in the middle of the curve. However, if it takes eight weeks to process or if transcripts get lost or some other error occurs schools may not get to your file until well into October or November decreasing your opportunity to get those oh so important pre-December one interview slots.