"They'll be feeling pretty good about themselves."
Fullback Logan Henry, prop Ben Strang and lock Henry Kilmister had strong games.
Wanganui will now face Wellington Development this afternoon at 1.30pm on Collegiate's No1 field.
That result will decide who they play in their last game on Thursday, with the other Pool B teams being Wairarapa Bush, East Coast and Hawke's Bay Development.
Koro said they will be in a good mindset today, not only coming off the win but having played very well.
Pool A of the tournament is made up of the Under 16 squads from the major unions in Wellington, Manawatu, Hawke's Bay and Poverty Bay.
Wellington started off their campaign with a comfortable 46-12 win over Poverty Bay in the other early afternoon game yesterday.
The Wanganui U16 team is
Ben Strang, Brandon Burberry, Cody Sherman-Phillips, David Perofeta, Dawson Sisson, Dillon Adrole, Dom Norling, Faleseu Taumailoto, Garth Metekingi, Harry Toho, Henry Kilmister, Jack Gay, Lenox Fold, Logan Henry, Max Crowley, Meven Phillippe, Oliver Toma, Peceli Malanicagi, Sam Sherriff, Sjon Marino City, Taumaru Hond, Tiaho Taiaroa, Tomasi Connor, Tyreece Adams.