Beyond Burnt Out
Remember: you can’t prepare well for your viva if you’re burnt out.
You can’t read, review and rehearse if you’re already exhausted. As important as the viva is and as urgent as it might feel to do something for it you can’t do what you need to do if you’ve got nothing left.
When you submit your thesis sketch out a plan or two for your prep. Make rest a central part of your prep period: there’s work to do and you probably have other commitments but if you don’t get enough rest you can’t do everything else that you need to do.
You can’t prepare well for your viva if you’re burnt out.