Congrats on getting through to the Interrupt test, Jennifer! I'm hesitant to share what the test is like because for all we know it could harm your chances rather than help. What I will say is there is a 7 minute tutorial before the actual test so plenty of time to get settled in what you need to do.
As for the call itself there's basic introductions and a quick brief on both the current test and then next steps if successful. Everyone does the test at the same time with cameras on. Make sure you test your camera, mic, and internet connection well before the call so you don't have to worry about any tech issues and then just buckle down and focus during the test. Good luck!