I think “performance marks identities” means the link between the grades or marks a student gets (performance marks) and their sense of who they are (identity). In other words, it’s about how scores and feedback can shape a student’s view of themselves — for example feeling confident if you get high marks or feeling discouraged if you get low marks. It can also refer to how people are labeled by their marks, which can affect motivation and how others treat them[tex].[/tex]