What Your Supervisor Knows
Your supervisor knows what vivas are like from their own experience but they might not have read the latest version of regulations for your institution. Ask them about their experiences and check what the rules say too.
Your supervisor knows what your works means. It’ll help to ask for their perspective. At the same time, you need to do the work to read over your work, reflect and write summaries that will help you think in advance of your viva.
Your supervisor knows who your examiners are and can offer insights into what they do, what they focus on and more. You have to take responsibility for making sure you’re really aware of what they do.
Your supervisor knows enough to be of real help as you prepare for your viva. Respect their time by asking for help in advance and being targeted with your requests. Recognise that for all they know about your work it’s you who is the expert on your research and your thesis.