"We want nothing more than to win. Winning would be amazing and would mean all our hard work over the past few months has paid off," he said.
"It would also help prove Rotorua Boys' High School's excellent reputation for music, as well as all the other positive things the students here are known for."
The band will perform two songs at the event, both of which they have composed and written themselves.
Tawhirimatea said they couldn't have got to finals without the help of their music teacher Cameron Hay, who was an inspiration.
Mr Hay said he was incredibly proud of the group. "It's a big achievement. They're one of the top six groups in country, which is really outstanding."
Neihana Mackey, from the reggae group 1814, has been working with Open Arms preparing them for this weekend.
He said it had been a pleasure watching the band grow and it was amazing how far they had come.
"I think they've got something really special, they could definitely have a shot at winning."
Whatever the outcome this weekend, the group were certain they wanted to keep singing and performing together in the future.
The group is made up of Tawhirimatea Witoko, Arapeta Paea, Wirihana Te Rangi, Te Hakaraia Wilson, Tuariki Brown, Lacey Betham, Te Tahu Kingi, Terence Apiata and AJ Moke.