I am still confused by the different names of the school years.
Is preprimary compulsory? What age do you start?
In nsw preschool is part-time for 3&4 year olds. It's not compulsory and is mostly play based.
Kindergarten is the first year of formal schooling. It is compulsory. Your child can start if they turn 5 on or before 31st July, but they don't have to if they're not ready. The parents can send them the following year if they wish but they must start the year they turn 6. Year 1 is the second year of school.