YOU could say that Ava Barker, 5, of Woolooware, has timed things perfectly.
From the hospital ward to the classroom, she has defied the odds and will join her brothers at school this year. Ava was diagnosed with leukaemia at 18 months.
After year of treatment and a relapse, she received a bone marrow transplant from an overseas donor in April last year.
She is in remission and is preparing for her big first day at Woolooware Public School next week.
"Just making it this far is a miracle," her mother Kirsty O'Brien said.
"When none of my kids matched to be donors — which was only a 25 per cent they would, we didn't think she would be so lucky."