Final Focus
I try not to be overly prescriptive or proscriptive when it comes to advice about viva prep.
There are certain kinds of work that are helpful when someone is getting ready for their viva but every candidate faces their own challenges and situation. There are approaches to planning prep (start with reading, for example) that would seem appropriate for every candidate…
…but what might be a good approach for one person could be bad for someone else. You might need to read your thesis over the course of a week in preparation for your viva while a friend has the opportunity and impulse to read theirs in one afternoon.
I emphasise the kinds of work that help not how someone “must” do them. It’s helpful to make a plan but you need to make a plan that works for you.
And with all of that said, one thing I would encourage is to give a little focus towards your confidence at the end of your preparations.
A few days before your viva take some time to think about your PhD journey. Note down what you’ve done and what it means. Recognise the talents that you have developed and see them as a foundation for confidence at meeting your examiners.