"They've been very focused and really busy. My goal for these students has been to encourage them to work together as a team, to learn team communication and collaboration," she said.
Mrs Venter said despite the hard work, the students enjoyed the experience.
"They love it. You can see they're just buzzing."
Mrs Venter said there would be three categories of winner - best product, best pitch, best teamwork and best tasting stand.
"We have a mystery shopper who will be coming through to give their opinion on the best tasting stand," she said.
The project is part of the school's Young Business Enterprise Programme. This is the fourth time the school has run the programme.
The team from "Empire Doughnuts" developed and made doughnuts in two different chocolate flavours. They were confident in presenting their product to customers, encouraging them to try a sample as they did their shopping.
"Unlike our competitors, we've gone for doughnuts with a hole in the middle because our research shows that customers like food to look good," said Lucas Martin, part of the Empire Doughnuts team.
"So our doughnuts look like real doughnuts."
Miro Murray said some aspects of the project had been difficult, while others had been "a breeze".
"It's been a lot of hard work, but we made sure we were well prepared and met all our deadlines," Miro said.
Pak N Save Whanganui owner Gareth Jones said the experience had been enjoyable for the Pak N Save staff involved.
"It's been wonderful partnering with St George's to support this great initiative and to encourage resourcefulness, creativity and leadership in this way," Mr Jones said.
He said the baked goods made by the students will be on sale at Pak N Save Whanganui for the next week.