Most students are only familiar with impersonal, written exams. So an oral exam can be quite challenging. These links give you information about how to prepare for an oral exam:

https://www.youtube.com/watch?v=PdasrqfaGSE

http://www.studygs.net/oralexams.htm

DAVID’s Top Tip

Never introduce technical jargon unless you have fully prepared for what it means. So, unless you are confident about using such terms, AVOID introducing concepts such as ‘ontology’, epistemology’, the refutability principle’ etc. This and other advice is contained here:

https://www.thoughtco.com/preparing-for-an-oral-exam-1857439