The Liberal Democrat used an adjournment session in the Legislative Council last week to address the plan and community concern.
He directed his item towards Education Minister James Merlino, saying the "scheme was wasteful" and teachers cannot speak out against the plan publicly.
"Teachers ... are aware that the school merger will result in a reduction in teaching positions," Mr Quilty said.
"The message here is clear: if you criticise the plan, you will lose your job.
"There are strong reasons to avoid merging the schools. With more choice parents are better able to avoid dodgy schools and have their children attend better ones.
"Competition is a thing. When you merge them all into one, you are going to end up with no competition and mediocrity.
"One student reported that she had moved schools to escape bullies and that the merger will force her back into class with those who bullied her.
"When parents have no alternatives, schools have little incentive to improve outcomes and address problems."
Mr Quilty said the money allocated towards the Shepparton Education Plan could have been better spent.
"Two campuses will be demolished and a brand-new campus constructed, costing the taxpayers $100 million, although we have not seen the $100 million yet.
"Twenty-five million dollars for each school would have gone a long, long way, but that option was never on the table."
Mr Quilty said during a consultation period the government asked respondents if they "preferred big new investments or minor improvements".
He said these resulted in the government being able to make the argument its survey conducted showed support for the Shepparton Education Plan.
"This is not a good way to gauge support for something; it's a way to manufacture it," he said.
Mr Quilty told parliament of Ms Baldi who was quoted by the ABC News saying during her consultation the government asked if she was in favour of extra funding and improved facilities, however wasn't asked if she was in favour of merging the schools.
"As the new school system is implemented Ms Baldi will have children attending six different campuses," Mr Quilty said.
"I have heard mums can work miracles, but being in six places at once might be just a little bit too much."
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