But the most intense criticism was directed at the Act Party's charter schools and National's flagship education policy for this election, the Investing in Educational Success (IES) programme.
Mrs Parata said New Zealand had a "magnificent" education system but it could not afford to be complacent. She said her party was "absolutely focused" on raising achievement for every child no matter their background.
"Decile is not destiny," she said, thumping her hand on the lectern.
IES would group schools from early childhood to secondary in clusters and would pay high-performing teachers and principals more to raise achievement at other schools.
Labour and others said they supported collaboration between schools but did not believe it should be state-imposed.
Mrs Parata shot back, saying the scheme was optional for schools and was being developed with the involvement of unions.
The PPTA meeting was nearly home turf for Labour and the attendees lapped up much of education spokesman Chris Hipkins' promises, which included scrapping charter schools, national standards and EDUCANZ and reallocating the $350 million budgeted for IES towards lowering class sizes instead.
United Future Peter Dunne pleased the audience when he said charter schools were not needed because the education system already allowed innovation and diversity - his Ohariu electorate included two state schools, a Brethren school and a Rudolph Steiner school.
New faces Miriam Pierard, of the Internet Mana Party, and Chris McKenzie of the Maori Party also made an impression when speaking of their personal experiences of teaching.