No, it is not compulsory at all. It is only compulsory from Year 1. In WA they have Kindy, then Pre-Primary and then Year 1,2 etc. So they start Kindy in the year that they turn 4 and the cut-off is 30 June. So they can be 3 turning 4 by end June. If they choose not to go then they will start at Year 1. For me, I think she will have missed out on alot of learning and social development if she skips Kindy and PP. Even if she skips these and starts Year 1 in 3 years, she will be 16 turning 17 in her final year of school. I think this is too young to be making plans about uni or working or even to know what you want to do with your life.

Kindy is 2 days, some schools do 3 days a week. PP is 5 full days.