Teachers can play through levels as a student at any time by clicking on My Account and selecting Test as Student from the dropdown menu. After switching to the test as student feature you'll want to click My Courses > Ozaria Classroom and select the class you'd like to test as a student under. If that is your first time, you will want to be sure you copy your class code from the main page of the Teacher Dashboard.
As you play through each of level your progress will be saved.
When you are done testing just click on My Account again and select Stop switching.