Education groups say more funding is needed to improve education for children with special needs.
The Education Review Office reported on Friday that only half of schools have good practices for including the 3% of children with high needs such as autism and cerebral palsy.
The report says ethical leadership and whole-school teacher training were hallmarks of inclusive schools.
But the Secondary Principals Federation and the Educational Institute say more funding is needed.
The federation's president, Patrick Walsh, says the biggest gaps are for children with low and moderate needs.
Associate Education Minister Heather Roy says the Government is reviewing special education, but no extra funding is expected.