Against the backdrop of internationalisation of education and the emergence of English as a global language, medium of instruction (MOI) has long been a controversial issue globally. The present study examined the relationships between secondary-level MOI (English, EMI; Chinese, CMI) and learners' tertiary-level academic achievement and perceptions. 434 tertiary-level business, science, and social science students in Hong Kong completed a survey and 18 of them also attended an interview. An overall significant difference was found in tertiary-level academic achievement between the EMI and CMI students. Significant differences were also found in their self-rated performance in and preferences for some but not all kinds of assessments. When analysed by tertiary-level disciplines, business students showed no differences while science students showed some, and social science students showed the greatest differences between the CMI and EMI groups. The interviewees highlighted academic and psychological challenges facing CMI students. Implications for educators and researchers are discussed. Copyright © 2023 Taylor & Francis.

Previous studies have associated L2 teachers' use of motivational strategies with learners' motivated behaviours in class such as raised attention and participation. The after-class effects of L2 motivational strategies, in contrast, have drawn less attention. This paper reports a study examining how L2 teachers' motivational interventions cause changes in learners' perceived attitudes and behaviours, both within and beyond the L2 classroom. To this end, 84 reflective journals were collected over one semester from 42 tertiary students in Hong Kong enrolled in a range of English courses. The results indicate that reported increases in the use of additional self-learning materials, attempts to put newly acquired English knowledge into practice, efforts to reduce mistakes, and in-class engagement were attributable to L2 teachers' motivational efforts. This provides evidence that the benefits brought by L2 teachers' motivational practice can transcend the classroom. Copyright ©Routledge.