Hi Cynthia,
As per my understanding, I guess you are trying to list all the selected City Schools (using DropdownTags) details inside the Block. If so, you can check the attached oml.
In my solution I have used Advanced SQL, but you can also achieve the same by defining loop logic (may be by using ListFilter etc..).
See this sample: EnterNumberOfStudents
Refer to the attached .oml file.
I hope this helps you!
Kind regards,
Benjith Sam