Mock vivas have always been a good idea. A space to rehearse for the viva, an opportunity to build confidence at responding to questions and gain certainty that you’re prepared for the real thing.
Now, more than ever, a mock – or something like one – is a very good idea.
If your viva is going to be over video link of some kind then have a trial run. It would be great to do that with your supervisor. Have a formal mock, get a feel for the technology and the flow of conversation when people are at a distance.
Then explore the software so that you have an idea of keyboard shortcuts if you need them, screensharing if it might help or whiteboards functions. Get a friend or two to have test calls with. Look into the camera. Check to see what you look like. Check to see what’s behind you. Check with someone on the other end that they can hear you well enough.
For your actual viva, everyone will be understanding if the signal drops out. Everyone will be understanding if you don’t have a perfect study or bookcase behind you.
Take a few occasions before your viva, if it will be a remote viva, to test the situation. Get a feel for what it will be like. A bit strange, but fine.
Something you can survive.