Are children are left behind by design?

Focus on test scores and evaluating schools and teachers based on these criteria alone has caused poorly performing and highly performing students to be left behind. No child left behind seems to work only for those students who are near proficiency levels as per this article.

Grading test-scores: Are children are left behind by design? | vox - Research-based policy analysis and commentary from Europe's leading economists: "Many U.S. Children are Left Behind by Design"