Don’t Rush
It’s not a good idea to rush into viva prep.
You don’t need to start the same day that you submit your thesis. You don’t need to start without a plan. You don’t need to over-invest time and effort. Following that path will lead to stress and missing things.
Don’t rush.
Focus on what you’re doing so you can do it quickly and well. A small amount of consideration can set you on the right path to getting the most from your viva preparation. Asking for help, fixing on what you need from the process and regular effort will help you get ready.
Get it done and do it well. As Seth Godin says, “Don’t rush… but hurry.”