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This question already has an answer here:

The book I am looking for was set in the future, overpopulation and poverty were everywhere. A group of homeless/poor kids (maybe young adults) went to a special building where they were placed into simulators several times (i.e., they went back home between each session) where they explored another planet.

At the end of the book, they went there again but soon find out that this time it was the real planet, not just a simulation, and they start rebuilding society.

marked as duplicate by Otis, Blackwood, Möoz, Ward, alexwlchan Oct 6 '16 at 6:13

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

10

Invitation to the Game by Monica Hughes.

http://en.wikipedia.org/wiki/Invitation_to_the_Game

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