Emily and Abby Hardwick started Year 1 and Olivia and Alice Blakemore are in Year 3.
They joined nearly half a million children from kindergarten to Year 12 who headed back to the classroom this week for the start of the 2016 school year.
Education Minister Peter Collier said there was a record number of students in public schools this year: an estimated 297,000.
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READ NOWNew public schools which opened in WA for the first time this week included Anne Hamersley Primary School in Ellenbrook ($15.8 million).