Higher education aims to educate diverse professionals to operate in an increasingly complex world. Yet, academic assessment practices still rely upon standardisation, namely, that all students should demonstrate their achievement in ways that are largely comparable, if not identical. In this study, we theorise assessment standardisation as a technology of normalisation upon student diversity and identities. Our study is located in one of the most complex learning settings in higher education: placements. We theorise how diverse students navigate the tensions arising from standardised assessment situations that assess highly personalised forms of learning in complex assessment settings. Our data material consists of longitudinal interviews with 16 disabled university students in Australia before, during, and after a placement. Our findings show that assessment suppresses and normalises students’ diverse identities, calling into question the inclusivity of such assessment practices. We discuss how assessment provides students with narrow ways of forming their professional identities. While this is the case for all students, the social consequences of assessment standardisation might be more crucial for those who do not fit the ‘norm’ set by assessment, such as disabled students in our case.