This article studies student pro-school/anti-school attitudes on different levels of social organization of school. We examine school level, class level, and clique level (clique is defined as a tight social group within a class social network). Cliques were identified using methods of social network analysis. We use multi-level regression approach on a sample of 7300 students from 104 public schools from St. Petersburg. Our findings show that: 1) Socio-economic differentiation of Russian schools does not lead to a polarization of pro-school/anti-school attitudes in different types of schools; 2) The polarization of attitudes emerges and is maintained at the clique level; and, 3) Clique attitudes have a significant impact on educational outcomes (net of a student’s socio-demographic characteristics and individual attitudes).