Education-based unions are picking apart the Government's scheme for charter schools.

The coalition's putting more than $150 million in the Budget for 15 new charter schools - and converting 35 state schools.

PPTA President Chris Abercrombie says we shouldn't privatise a public good, and believes there are 'better uses' for the money.

"Strengthening the state system and not siphoning money out of it - I think that would be the biggest benefit to the vast majority of students in this country."

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