co-educational
adjective /ˌkəʊ edʒuˈkeɪʃənl/
  /ˌkəʊ edʒuˈkeɪʃənl/
 (also informal coed)
- (of a school or an educational system) where girls and boys are taught together
- The school has now made the decision to go fully co-educational.
 
Oxford Collocations DictionaryCo-educational is used with these nouns:- school