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The 19-year-old athlete won a gold and a silver in both the giant slalom and slalom in International Ski Federation (FIS) series events last week.
Barwood is based at the Sugar Bowl Ski Resort in Lake Tahoe, California, where he trains at the Sugar Bowl Academy under head coach Guenther Birgmann, also of Treble Cone Race Academy.
His father, real estate agent Marty Barwood, told the Queenstown Times Adam was "very happy" with the results.
"It was a very good achievement to get in the States against the Americans and nice to get the podium placings, but his main goal at the moment is not to get the podium, but to get his points down."
Fellow Queenstown skier Harriet Miller-Brown (20), also training with the Sugar Bowl Academy, took second place in the slalom event.
Barwood is now competing at Winter Park, Colorado, where he had a "brilliant" first run on Tuesday's giant slalom event, starting 28th and finishing 16th - second for under 20 years.
However, he "blew it" in the second run, finishing 28th and sixth for under 20.
Competition has been delayed because of a snowfall of 30cm.
Mr Barwood said that together with his fellow academy competitor, Adam had been travelling for up to 18 hours at a time between ski areas, to compete at as many events as possible.
He won two under-20 slalom silver medals at Steamboat Springs, Colorado, last month.
His coach reported that the academy had won 10 out of 12 possible podium placings at the four Snow King FIS races, and Barwood was the top performer.
"It was one of my big goals when I started to coach New Zealand athletes to show that these Kiwis can be skiing and competing with the best in the world," Birgmann said.
"Adam and Finlay [Neeson, Ruapehu Snow Sports] showing that it can be done and their dedication, commitment and professionalism gives me the motivation to push and work even harder with them in the future to make it happen." Birgmann said Barwood and Neeson (18) had been working harder than any other young New Zealand ski-racing athletes in the past few years.