But on TIMMS, only eight nations have a higher average math scale score among eighth graders. (educationnext.org)
For example, between 2000 and 2005 — the five years spanning the introduction of accountability via NCLB — the average math scale score nationwide at the fourth grade rose by 12 points, roughly a year of learning. (educationnext.org)
The authors found that national NAEP math scale scores for eighth - grade students would go up as much as 8 points if every school had a one - hour later start time. (americanprogress.org)