Robuta

https://www.ets.org/toeic/about.html
The TOEIC program is the global standard in English-language proficiency assessments for the workforce. It gives organizations and universities the reliable...
english language proficiencytoeictests
https://aclanthology.org/Q14-1040/
Lisa Beinborn, Torsten Zesch, Iryna Gurevych. Transactions of the Association for Computational Linguistics, Volume 2. 2014.
language proficiency testsacl anthologypredictingdifficulty