http://englishlanguageitutoring.com/datasets/write-and-improve-corpus-2024

https://www.repository.cam.ac.uk/items/ba155087-0754-4c6b-ade8-68858e1df2f0

Nicholls, D., Caines, A., & Buttery, P. (2024). The Write & Improve Corpus 2024: Error-annotated and CEFR-labelled essays by learners of English. Apollo – University of Cambridge Repository. https://doi.org/10.17863/CAM.112997