I found this expression while preparing for the IELTS test:
"Teachers will take the class rolls."
What are these "class rolls"?
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The expression "take roll" means to "record which students are (and are not) in attendance." The teachers will call out the names of the students and note which students are present. We also use the expression "call roll" with the same meaning.
You can read the definition here.
The roll itself is the actual list of students who should be there. It may also be referred to as a class list or class register.