Access a Test's menu and select “Edit the Test Options”.
On the Test Options page, scroll down and click “Add User or Group” under Test Availability Exceptions. You will then see a pop-up window.
In the pop-up window, select “Not blank” then click “Go”. Select the user(s) then click “Submit”.
Set the test availability exception for the student(s). Click “Submit”. Note: Please check if the exceptions would contradict with the existing settings (e.g. Availability in Test Exceptions VS “Due Date - Do not allow students to start the Test if the due date has passed”)