Pupils (about 12 per class) study in the morning. In the afternoon they do music, art, sports and community service.
"We've got kids across the spectrum and a 95 per cent pass rate at Year 11 with the schools they then go in to," Mr Poole said.
The school is funded by the Villa Education Trust, which is also setting up a middle school in Upper Hutt next year.
He said the trust was non-profit, and he was cautious about for-profit providers running charter schools.
Charter schools will also be allowed to raise funds through sponsorship or partnerships with universities, the private sector or community groups, including iwi.
The Green Party says it is concerned that the trial will take money away from public schools.
"The Government must also explain if new spending has been allocated for this project or if the spending will come from existing education baselines," said Greens education spokeswoman Catherine Delahunty.
The trial has been opposed by unions representing teachers and principals.