It was established in 1916 on the initiative of the Ascola Society. Initially, it was a three-grade facility (I, II and III). Over the subsequent years, it developed into an eight-grade school. The school principals were Samuel Weinberg (1918–1919), Dr. Majer Bałaban (1920–1921) and, from September 1921, Dr. Joachim Frenkiel. The language of instruction was Polish. In 1933, it was granted the status of a state high school and remained open until 1939.
In the period 1918–1922, the school was located at 9 Tłomackie Street; since 1922, its address was 11 Tłomackie Street. In 1926, the institution carried the official name of the “Ascola” Society Junior High School and, prior to 1939, the “Ascola” Scoiety Private Junior and Senior High School. It was also known as the High School No. 122.
In 1926, it was a ten-grade school for boys with a total of 342 students.
In the 1930/1931 academic year, the school had 145 pupils in nine “departments” (classes), including 23 in preparatory classes, 25 in junior grades and 97 in senior grades. The tuition fee for one student in a preparatory class (Grade 0) was PLN 664. In junior grades (Grades 1–3), it was PLN 920–1,140, while in senior grades (Grades 4–8), it was PLN 1,160.
In 1926, the school staff (and the subjects they taught) included:
- Bałaban Majer, Dr (b. 1877) – History;
- Chinkes-Jung Meszulim (b. 1882) – Latin;
- Dawidowicz Bernard (b. 1892) – Mathematics;
- Dąbrowski Stanisław (not Jewish) – Polish Language;
- Frenkiel Joachim, Dr (b. 1878) – Introduction to Philosophy;
- Garbowicz Chuna (b. 1887) – ?;
- Grauberg Feliks, Dr (b. 1893) – school doctor;
- Hauke Leona (not Jewish) – Geography, Natural Sciences;
- Kahan Jakob, Dr (b. 1896) – Natural Sciences;
- Kahan-Dawidowicz Anna (b. 1899) – Secretary;
- Kunowski Dawid (b. 1889) – Mathematics, Physics;
- Mahler Rafał, Dr (b. 1899) – History;
- Młynarzewicz Mojżesz (b. 1885) – Drawing;
- Moronowicz Felicja (b. 1892) – Polish Language;
- Perl-Goldman Salomea (b. 1875) – Polish Language;
- Pinkiel Abram (b. 1888) – Mathematics;
- Rumelt Salomon (b. 1901) – Polish Language;
- Rutkowska Stanisława (not Jewish) – History;
- Sak-Rabinowicz Maurycy (b. 1877) – German Language;
- Segal Izaak (b. 1900) – Gymnastics;
- Sejneńska Rachela (b. 1889) – French Language;
- Sznejer Mojzesz (b. 1885) – Singing & Music;
- Weichert Michał, Dr (b. 1890) – German Language;
- Weinberg Hersz (b. 1883) – Religion;
- Wyszyńska Zofia (b. 1897) – Secretary;
- Spis nauczycieli szkół wyższych, średnich, zawodowych, seminariów nauczycielskich oraz wykaz zakładów naukowych, Warsaw–Lviv 1926, p. 250.