Numerous scholarly articles have explored the potential benefits and challenges of expanding public private partnership (PPP) in public service sectors especially health care, elders’ care services and education. The governing of PPP in education deserves close scrutiny to secure the public interest while adapting the vitality of private sector. By using PISA 2018 dataset, this study intends to compare the effects of educational governance between public school and private school on students’ learning outcomes and educational segregation. The multiple linear regression analysis shows that school types and admission policies have significant effects on student’s learning outcome and level of educational segregation. This study provides significant insight on research on school types, educational governance, educational policy and public administration. Further large scale administrative-data based and field trial research may be developed in order to distinguish the self-selection effect by parents or students in order to reach an empirical-tested causal interference.