There are lots of reasons why education is not as inclusive or effective as we want and need it to be. One reason why education faces so many challenges in some countries is corruption. Corrupt practices can happen at all levels in the education system, perpetrated by stakeholders from senior policy-makers through to teachers.
A useful overview of corruption in education has been published on the Curbing Corruption website. It looks not only at the nature of corruption but at strategies to address it and the types of reform that are needed.