This article presents findings on students' views and experiences of tiering in Northern Ireland and Wales from a children's rights perspective. It considers the extent to which tiering fulfils the rights to education, best interests, non-discrimination, and participation under the Convention on the Rights of the Child. It emphasises that while the majority of students were supportive of tiering, their responses highlighted a range of negative effects of tiering on students taking foundation tier. Students described the impact of being placed in the foundation tier on their self-esteem and relationship with their peers, indicating that being allocated to foundation tier can have a labelling effect. Students who were taking foundation papers, or a mixture of foundation and higher-tier papers, were more likely than those taking higher-tier papers to report that they wanted to change tier and to raise issues overall regarding tiering. Furthermore, students who were faced with these difficult choices often had a poor understanding of several aspects of tiers. The article argues that alternative forms of differentiation should be considered, and presents students' perspectives on some of these. It argues that we must ensure that young people have a good understanding of tiering and that their views and experiences of tiering are taken into account when considering further reforms to GCSEs.