You can enter the test no earlier than 15 minutes before the scheduled exam time. In other words, if you are signed up for the slot at 10:00, a button with the name of the available test will appear at 09: 45 in the Examus extension (the button is only available after logging in to the Examus extension).
In thirty minutes after the start of the slot, the button will no longer be available, and you will no longer be able to enter the slot. If you are registered for the slot at 10:00, you will not be able to enter the test at 10:30. Move your examination to another slot, or contact your University with a request to move it.
!!! Always pay attention to the difference between your time zone and Moscow time. The Examus interface ALWAYS uses Moscow time (UTC +3).