Your receipt is the email purchase confirmation you receive.
You can access and take the test immediately, or wait up to 90 days to take it. (Both attempts must be completed within 90 days)
Once you begin your test session, you must complete the test within one session, there is no save/return later option.
Before launching your test ensure you are connected to a reliable internet source. Any disconnection and/or interruption will result in your test being failed if you have not submitted enough correct answers by the time of disconnection.