ELL language learning and achievement

The earlier that English-language-learner students are reclassified as English-proficient, the more likely they are to graduate high school. The researchers found that the graduation rate gap between students who were reclassified as English-proficient in elementary school and students who are still ELLs in high school was striking, the latter less likely to graduate.
Huang, M. et al. (2016). English learner students' readiness for academic success. San Francisco, CA: WestEd.
https://www.wested.org/resources/english-learner-students-readiness-for-academic-success/