What You Have
It’s not wrong to think about what you want or need for your viva. Better to focus first on what you already have to help you succeed.
You have a thesis.
You have experience.
You have regulations.
You have expectations.
You have examiners.
You have a supervisor.
You have colleagues.
You have friends.
You have talent – you must have this if your viva is coming up!
You have a lot to help you. Maybe you have doubts too, but you don’t want or need those. What are you going to use to work on beating them?