Essential information on teaching practica at the Faculty of Arts is to be found here: https://www.ff.cuni.cz/studium/bakalarske-a-magisterske-studium/ucitelstvi-pro-stredni-skoly/informace-pro-realizaci-pedagogicke-praxe/
The practicum takes place in secondary schools. Only exceptionally, in well justified situations and with the express approval of the practicum guarantor can the practicum take place at elementary schools.