And "first-grader" is something completely different, those are six years old, not sixteen, so that was completely out. Plenty of traps and completely inappropr

And "first-grader" is something completely different, those are six years old, not sixteen, so that was completely out. Plenty of traps and completely inappropriate translations as well. I ended up using "first-year", "second-year" and "third-year", and "firstie" for when older students were looking down on them.