Graeme Boocock wrote:

I have a Jewish relative (James Lewin, 1887-1937) who attended Sophien-Gymnasium
(sometimes spelled "Sophiengymnasium") in Berlin in 1906. I would like to
ask what happened to this institution and if its records still exist.

Don't know about records.
http://commons.wikimedia.org/wiki/File:Berlin_Direktoratshaus_Sophiengymnasium.jpg

Ernst Lubitsch and Fritz Kahn wher educated there.

Evertjan Hannivoort.
The Netherlands.
(Please change the x'es to dots in my emailaddress)