Schools will look at your AADSAS GPA. Because different universities have different grading methods (using pluses and minuses, pass/fail, point system, etc) AADSAS will take your transcript and convert it to the AADSAS GPA which will make it easier to compare students. Also, some schools will drop the lower grade on a repeated course. This isn't the case with AADSAS, both classes will be factored into your GPA.
If you are planning on matriculating in 2012, you will need to submit your application in June of 2011, as the person above me said.