High School for teenage English speaking (Nuremberg)

Hi folks.
I am still in Raleigh, NC, but there is a possibility of my relocation to Schweinfurt or Wurzburg area. I have a 14 yr old and 16 yr old who will be rising 9th and 11th grade respectively. Neither of them speak German fluent enough for academic instruction purely in German. I know of two International schools in the area, ISM near Schweinfurt and FIS in Erlangen, but they are very expensive. Does anyone know of any options for them, such as a German Gymnasium that has a mentor program for non-German speaking teens? Any help would be much appreciated. -Jeff