As of 1 September 1941,Jewish children were only allowed to attend schools that were exclusively intended for Jewish students. Schools for Jewish students were established in all parts of the country. The Jewish Lyceum at Fisherstraat 135 was opened in The Hague on 15 October 1941. This Jewish Lyceum continued to exist until 26 November, 1942, after which the school was moved to Bezemstraat under the name Jewish School for Secondary Education. The school continued to exist until 15 April 1943.
Johnny van der Sluis was in the fourth year of the HBS department of the Jewish Lyceum in The Hague in the academic year 1941-1942. After promotion he started in the fifth year of the HBS in the school year 1942-1943.
Wally de Lang, Childhood Final Chord. Memories of the Jewish Lyceum Fisherstraat The Hague 1941-1943 (The Hague 2003) 17-18, 238, 243