This was a fantastic piece of work, and I cannot recommend it enough. It manages to thread a pretty solid line between the universality of being a teenager trapped in a system that does not care about you and is actively hostile to whit, along with experiences more relatable to specific subsets of people, all while keeping it all very solidly written.
The endings are also a very strong point here because each adds context and texture to the work and the characters. Reaching a single ending and stopping would be a disservice to both yourself and the fiction, please push on and experience them all and read the afterword. The understanding of everyone involved really brings depth to each ending and the full picture is something I resonate with very deeply.