School counsellors can play a powerful role in closing the achievement gap by incorporating principles of social justice - that is, equity and advocacy for all students - into their practice. This new resource for pre-service and in-service counsellors addresses the reasons why some students are more likely to encounter academic failure (racism, sexism, heterosexism, classism), and challenges readers to play an active role in bringing about the conditions for student success. Offering a variety of vignettes, strategies, activities, and reflective individual and group study questions, the book provides the framework for how school counsellors can mitigate the impact of negative factors hampering academic performance and healthy development. The book details six functions of a school counsellors that move schools toward more just practices and, ultimately, to higher test scores and increased student achievement.