Thai Higher Education (Thai HE) is changing, due to international reform. This paper presents data collected in a longitudinal study carried out in Thailand during 2017–2018 using the US version of the National Survey of Student Engagement (NSSE) and qualitative interviews. We offer a case study about the cultures and engagement of three groups of students found at an international private university in Thailand. The groups studied were international students, Chinese students in a mixed Thai/English curriculum and Thai students studying in Thai, all situated in a Thai HE institutional community. The (NSSE) was administered to 179 students: 89 in an International College, 54 Chinese students and 36 Thai students, as a control. Our results showed different attitudes toward studying, teachers, memorisation, participation, critical thinking, and empathy. This paper concludes with a discussion of how students in an international university in Thailand arrange themselves socially, and why this matters.