You can’t control how long your viva will be. Or what question you’ll be asked first. Or what parts your examiners do or don’t like. Or how they express themselves or pose their questions to you.
You can’t control the flow of the viva. Knowing which questions commonly come up won’t mean you can control if they’ll be asked to you. You can’t control whether or not a response to a question will be satisfactory. You can’t control if your examiners agree with you on a methodological point. You can’t control whether or not they are going to ask that one question which you dread being asked.
But you can control how you prepare.
You can control what you do to get ready.
You can control how you start your viva day.
You can make choices to help lead you in the direction of confidence for your viva.