At the end of your doctoral studies, one of the final stages is the Doctoral Examination. This can be one of the most stressful stages of your studies, so it’s important to familiarise yourself with the procedures, as well as get an idea of what to expect.
https://edst-educ.sites.olt.ubc.ca/files/2013/05/Doctoral-exam-policy-change-Jan-2012.pdf
https://howtophd.podbean.com/e/ep05-how-to-prepare-for-the-viva-part-1/