Hi @cjennings1
@Robbie_Grant 's advice is spot on; but also keep in mind that you can "manually" unlock a quiz attempt for students using the Moderate quiz feature, in in that same Moderate Quiz dialog box, you can set the numbers of attempts permitted.
I got the impression that when you said you "manually open a quiz for a student" that you meant extending the due dates and the availability dates (I could be wrong). This makes the quiz available to all student. When you use the Moderate Quiz feature, you can open the quiz for just the intended student.
Learn more at .....
I hope this is helpful, and I hope I did not misunderstand what you were asking.
Kelley
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