In Sunday's final, they came from 21-0 down to beat Australia 52-33 and claim their fifth triumph in nine rounds this season.
"This is a magnificent achievement by a team which has excelled in every tournament this season," Tew said in a statement.
"The team has a proud record of consistency which is remarkable in a series where the competition is getting tougher every year as we build towards Rio in 2016."
The top four from next year's world series will qualify directly for the 2016 Olympics in Brazil, where rugby sevens will make its Games' debut.
(Writing by Nick Mulvenney, Editing by Peter Rutherford)
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