Alexei Panshin’s 1968 Rite of Passage is a standalone SF novel. It won a Nebula Award and was nominated for a Hugo.
Mia Havero grew up on a great Ship, an asteroid-sized vessel that wanders from star to star. It’s all she’s ever known. Mia’s Trial, a mandatory test that winnows the unfit from the fit, is approaching. If she passes, she will live out her life on her Ship. If she fails, she might be exiled. Or dead.
Mia Havero is twelve, going on thirteen.