The Wanganui Kayak Club is a division of the Wanganui Multisport and Triathlon Club and Brooke's co-coaches Brian Scott and Aaron Cox are excited about the youngster's future.
"It's difficult to use his times from the nationals to judge how he compares going into the GP3, but mentally Toby is right up there," Scott said yesterday.
"It really does come down to the conditions - the weather plays such a big part in this sport. He knows what he has to do and whatever happens he will definitely improve ... simply through competing at this level."
Brooke said he, too, did not know how he would shape up against the Australians this weekend.
"I feel really good after the nationals, but I really have no idea how I will compare at this level," he said.
The Australian regatta is one of the biggest outside the world championships and the Olympics and features the cream of the world's paddlers including Kiwi Olympic gold medallist Lisa Carrington.
"This is a big event and I'm sure Toby will rise to the occasion in his age group," Scott said.
"I don't think an U16 has ever been selected as part of U18 squad for this event, so that's a feather in Toby's cap."
Brooke predicted the 1000m event would be his strongest, although he did not discount featuring in the finishes of the 500m or the 200m.
"I won the 5km at the nationals and that was a tough race.
"I wouldn't necessarily say the further the better for me, but I think the 1000m will be my strongest event this weekend," Brooke said.