Review The Recent
As you prepare for your viva make sure you review your most recent work. Refresh your memory on how it adds to the contribution of your postgraduate research. You’ll need to talk about this at your viva.
As you get ready take a little time to review recent publications. As you’ve been writing up there’s a chance there are interesting or relevant papers you’ve missed. Taking a few hours to check will help your feeling of capability as a researcher.
You have to read your finished thesis to be well prepared. Reviewing the details and the most recent expression of them will help your confidence for the viva.
There’s a lot of history you have to review for your viva: old notes, past papers and so on. Take a look at the most recent material as well to be ready for your viva.