Sandalika said they had been polishing their argument and were ready for the finals this evening.
"It's arguing with a purpose," she said.
Joy said by going through the preliminary and semi-final rounds, they had the opportunity to build up to the final.
Lyon O'Neale Law clerk Stephen Taylor had been mentoring the girls for the competition.
"The amount of work they put into it is phenomenal," he said.
The girls had been arriving to school at 7am to practise, and would stay after school to ensure they were ready.
"I am super proud of them," he said.
"They have listened to the advice ... and have grown in confidence. They thoroughly deserve to be in the final."
What is a moot?
* A moot is a legal debate in a courtroom setting with a judge or a panel of judges. The debate is over an area of uncertainty in the law.
* Run by the University of Waikato, it is the only competition of its kind in New Zealand.
* All members of the winning team will receive a $3000 scholarship towards tuition fees at Te Piringa - Faculty of Law and a cash prize.