In South Australia, public primary schools have one intake date, this means:

• If your child turns five years before 1 May they can start primary school the first day of term 1 of that year. 
• If your child turns five on or after 1 May they can start primary school the first day of term 1 of the following year.

The one intake date brings South Australia into line with others states and means every child has four terms of pre-schooling and reception before starting the rest of their schooling.

Your child must be at school by their sixth birthday – this is the compulsory school starting age.

https://www.sa.gov.au/topics/education-and-learning/schools/starting-school