https://www.k12dive.com/news/is-lack-of-teacher-prep-blame-for-math-performance-woes/744221/
One expert suggests a decline in certified teachers and professional development opportunities is a root cause for lagging achievement.
teacher preproot causegapsblamedone
https://www.edweek.org/teaching-learning/performance-gaps-widen-as-high-achieving-students-progress-in-high-school/2014/04
An Education Trust report follows high-achieving students through high school and discovers those from low-income backgrounds and students of color don't excel...
performance gapswidenhighachievingstudents