In this chapter, we propose to explore these determinants of a low level of subjective well-being, taking into account the variation of these connections according to a certain number of variables that have been clearly identified in the literature, that is, differences in gender and social class. In other words, we aim to highlight and assess the role of school-related determinants in children’s low level of overall life satisfaction (OLS), and their variations across social classes. More specifically, we insist on the phenomenon of accumulating inequalities in terms of Overall Life Satisfaction (OLS). This accumulation occurs when (1) school-related factors that affect the level of life satisfaction are not as likely to be experienced by children according to their social background, and when (2) children’s OLS levels are not impacted equally by school-related factors, depending on whether they come from upper-, middle- or working-class backgrounds.