I'm looking for a science fiction novel I read in the early 1980s about a group of young adults on a sort of university or academy spaceship travelling the galaxy. On one planet they stop at they are coerced into taking part in gladiatorial games with the dead losers being described as "perdido" (lost/forgotten) and never spoken of again. I seem to recall the gladiator planet was called "Hel" or "Hell" and the residents were called "Hellers".
There is No Darkness by Joe and Jack Haldeman matches well.
Contains the elements of young adults on a galactic tour, gladatorial games, and the Hellers. The ship was called Starschool.
The sections of the book are "Earth", "Hell", and "Construct".
Curriculum Notes - Earth
Most of what people think they know about Earth is wrong.
Curriculum Notes- Hell
Hell is the fourth planet out from the star Delta Pavonis.
Just flipping through it, it looks like the gladiatorial games actually took place on Earth. I need to re-read this.