Gender: boy
School:
School #20B
A search for 'W* Zloczewski' turned up only Wolf, whose birthdate made him the correct age to have attended the school that he did.
I connected Wolf to his family by matching their addresses. Wolf had a father (Boruch, b. 1904), a mother (Liba, b. 1902), and two siblings: an older brother (Icchok, b. 1928), and a younger sister (Dwora, b. 1932).
The family was deported on March 28, 1942, during the month of daily deportations to Chelmno.