It was established in 1904 as a two-grade school. By 1907, it had become a seven-grade high school, with the eighth grade added in 1915. In 1916, the post of the principal was taken by Mieczysław Rotbard.
It was located at 50 Długa Street. It bore the name of the Fryda Mirlasowa Girls’ High School (1926) and later the Fryda Mirlasowa Private Senior and Junior High School (prior to 1939). It held partial accreditation as a state high school until 1926, after which it obtained full state rights. Officially, it was called the State School No. 151.
The language of instruction was Polish. In the 1920s, the school offered classes in Hebrew, but they may have later been discontinued as they are not mentioned in school records from 1931.
In 1926, it had eight grades and a total of 183 students organised into nine “departments” (classes).
In the academic year 1930/1931, it had a total of 263 students in 10 “departments.” The school had 29 students in preparatory classes, 56 in junior grades, and 178 in senior grades. The tuition fee for one student in a preparatory class (Grade 0) was PLN 480–600. In junior grades (Grades 1–3), it amounted to PLN 920–960 , while in senior grades (Grades 4–8) – to PLN 1,200.
In 1926, the school staff (and the subjects they taught) included:
- Askenazy Helena (b. 1892) – French Language (graduate of the Sorbonne);
- Festenstadt Maria (b. 1897) – French Language;
- Hertz Amelia (b. 1878) – German Language;
- Horwitz Kamila – school doctor;
- Hufnagel Leon (b. 1893) – Physics;
- Kirszbraun Arnold (b. 1895) – Latin, History;
- Korzon Maria (b. 1892) – Geography, Natural Sciences;
- Lewin Zofia (b. 1871) – Polish Language;
- Marder Ela (b. 1900) – Gymnastics;
- Mirlas Eugenia (b. 1892) – Mathematics, German Language;
- Mirlas Jakub (b. 1890) – Mathematics, Calligraphy;
- Przeradzka-Radyx Wiktoria (b. 1884) – Polish Language;
- Puder Dorota – secretary;
- Rotbard Felicja (b. 1896) – Polish Language;
- Rotbard Mieczyslaw (b. 1887) – Mathematics;
- Salinger Zygmunt, Dr (b. 1885) – History;
- Segał Jakub (b. 1880) – Introduction to Philosophy;
- Szatkowska Felicja (b. 1890) – Handicrafts;
- Uzdański Stanisław (b. 1887) – Drawing;
- Wainfeld Romana (b. 1892) – Drawing;
- Wajdenfeld Bronisława (b. 1896) – Singing;
- Wiener Ludwik (b. 1885) – Polish Language, History;
- Winawer Adolf (b. 1880) – Mathematics;
- Winkler Samuel (b. 1895) – Hebrew Language.
- Konarski S., “Warszawskie średnie szkolnictwo ogólnokształcące,” [in] Warszawa II Rzeczypospolitej 1918-1939, book 5, Warsaw 1973, p. 228–229.
- Spis nauczycieli szkół wyższych, średnich, zawodowych, seminariów nauczycielskich oraz wykaz zakładów naukowych, Warsaw–Lviv 1926, p. 268.
- Szkoły w Rzeczpospolitej Polskiej w roku szkolnym 1930/1931, Warsaw 1933, p. 468.