Uworld, in a game of points and percentage

[Silverish]

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Bill has been using FA and his Pathoma to prepare for STEP1. He is averaging 220 on NBMEs. Suddenly, Bill decides to use Uworld. Once all of Uworld is completed, what do you think he will be averaging on his NBMEs now? Why?

I know Uworld is SUCH a monster and valuable resource. But I'm trying to understand how it can jump NBME averages and by how much!
Thanks for any replies.