Emailed: Session has been created and then emailed to the candidate. It has not been started, but is available for use and has not expired.
Scheduled: Session has been created, but NOT emailed, to the candidate. Typically happening when admin is planning to start the test directly from this computer (Start button), or when copying the test session link (Copy icon) to include in a separate email to the candidate (not sent from dashboard).
Incomplete: Test session link has been clicked on and is in progress, in some way. Candidate may have only clicked to read instructions and not actually completed a test yet. Or some tests may have already been completed, but all tests have not.
Expired: Test session has expired based on your expiration settings. It's no longer active and test credits have been returned to your available credits.