“…Results presented in Columns 4 and 5 show that having a larger proportion of repeater peers affects students from families without regular homework checking more severely on cognitive assessment score and school engagement compared to students whose parents check their homework regularly. Finally, given the ample evidence that establishes the connection between mother's education and children's cognitive and social development (for example, Menaghan and Parcel 1991;Parcel and Menaghan 1994) Table 7 Heterogeneous and delinquency (Hillman, Sawilowsky, and Becker 1993;McCord 1991), we further examine whether the negative effects of repeaters are moderated by mothers' education level, where we divide the sample in half by mothers with "a college degree or higher" versus mothers with "a high school degree or less." Results show that the negative spillovers of repeaters on academic performance and cognitive assessment score are primarily driven by students whose mothers have below-college education (Panel A, Column 8).…”