To access the test options, locate the exam you would like to add exceptions for.  Hover over the name of the test, and click the chevron button that appears next to the test and select Edit the Test Options from the menu that appears.

Scroll down to Test Availability Exceptions and click the Add User or Group button.

You will now see a screen labeled Add User or Group, which lists all the of users and groups in your course.  To add users or groups, check the boxes next to the names of the users you wish to create exceptions for.  When finished, click the Submit button

The students selected in the previous step will now be listed under Test Availability Exceptions

1. Name: The student's name will appear here.
2. Attempts: Select the number of attempts allowed for the student
3. Timer: Enter the time limit in minutes allowed for the selected student, and check Auto Submit to have the test submit automatically.
4. Availability: Click on the calendar icon to specify the availability of the exam for the student if the student would be taking the exam at a different time than the rest of the class.
5. Force Completion: Click here to enable or disable force completion for the user (not recommended)
6. Click the X button to delete the student from the list of exceptions

When finished, scroll down to the bottom and click the Submit button.