One of the staff works with sets and she needs the student details of whoever present in that list with school id.
While exporting the set list there in school id option available so for which see export that from student manager and then put manually the school id in the set list data.
Which is a lot of work to do, so it will be better if you can add school id in standard or custom fields, so whenever she will export the set list she can only tick the checkbox of school id and that's it, it will save a lot of time for her.