Tests are available on a first-come, first-served basis. When you pass the screener questions, you'll qualify to take the test, but multiple contributors might also qualify for the test while you're responding to the questions.
The system will assign the session to you once you select Accept. If you receive the "This test is no longer available" message, another qualified contributor claimed the session before you.
If you need to remove the session from your dashboard, please decline the test.