Generally, educational resources need to be allocated for the purpose of reducing inequalities by targeting students from poorer socio-economic backgrounds. Latin American countries currently have better educational resources (books, instructional material and laboratories) in schools with students from wealthier socio-economic settings (Figure 5). Some of the best-performing OECD countries in the PISA tests, such as Estonia, Finland, Germany, Korea and Slovenia, tend to distribute educational resources more equitably. Successful school systems in the OECD have sought to balance the distribution of staff, ensuring that struggling schools have a sufficient number of highly qualified teachers.