This study explores how the participation of parents on school committees improves student achievement. In decentralized education systems like the one in Indonesia, parents’ participation has become a focal point for improving the quality of education. The data for this study were collected using questionnaires distributed to 250 students in state senior high schools, selected by quota-purposive sampling. The qualitative findings of this research are threefold: most parents participated in student learning only by providing material aspects, such as tuition and books; most parents had a misconception that it was the school that should solely be responsible for the education of their children; busy parents tended to ignore the progress of their children’s learning. In order to create social capital for their children, parents need to be active in the learning process, cooperate with school officials, and get involved in the planning of social activities.