If you want to find students from this school, you can always go to the Student List and sort the list by schools (selecting school #7B). Once you choose a specific name to research, you can click on the school name in the student's profile for more info. In the case of school #7B, that info is:
School #7 was a school for girls in Lodz. The students in #7b attended classes in the afternoon. Most students were between 9 and 14 years old, meaning that they were born between 1927 and 1932.
School #7 was located at Ulica Zgierska 70. The street name was changed to Hohensteinerstrasse when German occupation began in 1939. You can read more about Ulica Zgierska at http://www.lodz-ghetto.com/zgierska_street.html.