We under utilize Perseus Jackson and it's shows.

Like, he's been to tens of schools and we still write him like an idiot? We know his schools from 12 and up, by before that?? Eight years of potential.

He could shoot a gun. Maybe he's an artist. Maybe he can write music, or poetry. Maybe some sick school taught him advanced surgery for a while. Maybe Sally was really sick and Gabe put him into a wild assassin school for a month or two. Seriously. Percy's past school life could be literally anything.

Hell, maybe he was out of state. Zeus doesn't care about cars, or trains.

Honestly, the well of potential here.