You probably already know, but moving into area won't help you get into a selective school in Sydney. Testing is done the year before and is extremely competitive. Having said that there are some great comprehensive schools that you could move into area for?
Yeah that's right. It might be a moot point if they don't pass the selection exams to get into the school in year 7. Again, the school DS1 goes to is 100% selective for year 7 students and if you don't pass the exam and their selection criteria, then you don't go. His school is also extremely sought after so even though we will apply to send DD1 there, there are no guarantees that she will get in. Not even having a sibling at the school guarantees it. You have to apply for a selective school when they are in year 5, so it's a long process. If it were me and you definitely knew that you wanted a particular model of education, I'd just look at going private and then there are no selection processes. Either that or hothouse your kids to make sure they pass the exams. But I know you're not like that.

ETA - we cross posted