Ditto HappilyMom & CAMom - push this back on the teacher.

IMO, after their reading level gets to a certain point, it's a useless number. Just let them read what they want. I honestly don't even know exactly where my son is at now, because the new school doesn't use lexile, and he's still making 100's on all the AR tests, but I honestly can't be bothered... he's at least around 1100-1200 lexile, and he's only in 3rd grade. Screw it, I let him read graphic novels and whatever else he wants, so long as it isn't super gross or scary.

~amy