* Youth's battle-hall: Emphasizes the competitive and sometimes combative nature of high school.
* Learning's longship: Highlights the journey and voyage of education.
* Wisdom's waiting-place: Focuses on the potential for growth and knowledge gained.
* Future's forge: Emphasizes the shaping of one's future that occurs during high school.
* Book-walled cage: (slightly darker) A more cynical kenning emphasizing the feeling of confinement or structure.
The best kenning will depend on the context in which you're using it.