The Amnesty International website states:
This practice leaves thousands of Romani pupils in substandard education in schools and classes for pupils with "mild mental disabilities" or ethnically segregated mainstream schools and classes.
In a briefing to the Slovak government, Steps to end segregation in education, Amnesty International points to serious gaps in the enforcement and monitoring of the ban on discrimination and segregation in the Slovak educational system.
A powerful video about school segregation for Romani children in Slovakia can be viewed here. The situation is comparable to that in the Czech Republic: