The results of searching for "International school": 3 English-speaking places
There are also organizations that speak other languages: Russian.
Podbielskistraße 126A 30177 Niedersachsen Region Hannover Germany
Bruchmeisterallee 6 30169 Niedersachsen Region Hannover Germany
Paderborner Straße 1 30539 Niedersachsen Region Hannover Germany