The viva is you and your examiners; the viva isn’t you versus them.
You don’t have to challenge all their questions. They don’t have to bring you and your work down.
It’s not combat. It’s not a trial. It’s not an ordeal. You don’t have to prove that you’re better than them somehow.
It’s you AND them creating your viva.
Instead of worrying about what you have to do “to win” – make sure you’re ready to share your best self and best stuff. Make sure you know what you need to about the process and your examiners to help the viva be as good as it can be.