Nii-Okai, D. .; Acheampong, E. .; Mahama, I. .; Mensah, J. K. .; Imoro, O. .; Marfo, R. .; Kwaw, R. .; Odame-Mensah, S. . Sandwich Model of Educational Upgrading in Ghana: A Transitional Challenge in Disguise. ESJ 2021, 17, 136.