no child's behind left?

This is a hard nut to crack, here - how can we reconcile the goals of educating every child, and really educating them, not just "teaching to the test" or socially promoting them from grade to grade, yet on the other hand realizing that not every child will be a genius, and in fact some children, who face special learning challenges, may never learn as much as others of their age or grade level?
WP: 'No Child' target called out of reach - washingtonpost.com Highlights - MSNBC.com