This is the 2021 update for the NSW, Sydney High School catchment map. Looking at the data, it appears every public school has been assigned a specific catchment zone, this is previously not the case.
In the next few days, I will do a comparison and list the specific catchment change for the Sydney metropolitan area.
2021 NSW, Sydney High School (Secondary) Catchment Map
School intake area
As usual, contact the school in question or Department of Education for the final confirmation and you can also access the full NSW and Sydney Public School Catchment Map by following this link.