My parents moved with my younger brothers from sA to NSW (nearly 20 yrs ago now - so info may be out of date). Youngest bro was in yr 7 here (last yr of primary in SA) but was born in Nov so my parents were given the option of putting him back inYr 7 (but as 1st yr of high school) to help with maturity. They started out doing this but within 6mths he was into Yr 8 where he probably would have gone if he wasn't born so late in the year as academically the yr 7 stuff was too easy. I don't remember them having to do anything further than providing copies of school reports.