Yeah, I'm not looking to hit a particular level for the sake of hitting a level. But I think the books he reads are too easy for him. And when I noticed that the Harry Potter books (which he read years ago) are listed at higher levels than any of the books he's read more recently I became more concerned.

I don't put a lot of faith in scores that are generated by the 1000s, but I figured it was a rough guideline.

We have several of the books suggested here already so I'll see how it goes. I will suggest he read one "grownup" book a week and provide him with a bunch to choose form.