The 'Ikale Tahi could only manage one win over Canada in the last of their three games at the recent Pacific Nations Cup but have three more warm up matches before the world showcase.
Kefu said after a month of training and touring together his players were in good shape.
"We've made some big shifts in terms of weight loss and body fat loss. We also made some huge shifts in terms of intensive running," Kefu said.
"It was important that we get a win considering the last four weeks of training have been pretty tough on the boys."