Rite of Passage Author:Alexei Panshin The Nebula Award winning novel by Alexei Panshin — Man lives precariously on a hundred hastily-established colony worlds, and in the seven giant chips that once ferried men to the stars. Mia Havero's Ship is a ruthlessly rational society that tests its children's right to exist by casting them out to live or die in the hostile wilds of a colony ... more »world. Though her time of Trial is fast approaching, Mia is to learn that it is not she alone, but her world -- and mankind -- that are on trial.« less
The description suggests that this is some sort of hokey "aliens come down and warn us to be nice to each other" type of story. Don't be fooled; it isn't that at all. It's a coming of age story of both the protagonist and the race, full of errors and mistakes and growth.
It's also a very entertaining book and well worth the reading.