How to Prepare for an Oral Exam or Viva: Questions, Tips, Practice

Reviewed by Prof. Dr. Alexander Holtermann · Updated 16 October 2026 · 5 min read

Prepare for an oral exam by speaking, not reading: explain topics aloud from memory, practice likely questions with someone else and rehearse a short opening.

Key takeaways

Oral exams test whether you can explain, connect and defend ideas in real time. Your preparation must therefore include speaking, not only reading and writing.
Explaining a topic aloud from memory is retrieval practice in its purest form, one of the most effective learning techniques known (Roediger & Karpicke, 2006).
Examiners usually move from broad to specific: overview question, follow-up on details, then a transfer or “what if” question. Prepare all three levels.
In a UK viva voce, examiners discuss your thesis or project with you; the conversation is about your decisions, their justification and their limits.
Saying “I don’t know, but I would approach it like this” is a good answer. Silence or bluffing is not.

Types of oral exams you may face

Oral examinations look different depending on country, level and subject. In the US, undergraduates meet them mainly in language courses, some honors programs and capstone presentations; graduate students face oral qualifying or comprehensive exams and the dissertation defense. In the UK, the best-known form is the viva voce (Latin for “by living voice”), the oral examination of a PhD thesis, which some universities also use for master’s dissertations, professional degrees or to check authorship of coursework. In many European and international programs, oral module exams of 15 to 30 minutes are a standard alternative to written finals.

Format	Where common	Typical length	What is tested
Oral module exam	Europe, international programs	15–30 min	Course content, connections, application
Language oral	US, UK, worldwide	10–20 min	Speaking, comprehension, accuracy
Oral qualifying / comprehensive exam	US graduate programs	1–3 hours	Breadth and depth of the field
Viva voce (PhD)	UK, Ireland, Commonwealth	about 1.5–3 hours	Your thesis, its originality, methods and limits
Authenticity viva	Some UK courses	10–30 min	Whether you understand and wrote your own work

How oral exams usually run

Most oral exams follow a recognizable pattern. After a short welcome, the examiner often lets you start with a topic of your choice or an opening question such as “Tell us about …”. Then the questions become more specific. Many examiners work in three levels:

Reproduction: “What is …?”, “Name the main approaches to …”. Explanation and connection: “Why does … happen?”, “How does this relate to …?”. Transfer and evaluation: “What would happen if …?”, “How would you apply this to …?”, “What are the weaknesses of this approach?”

The first level is your entry ticket; the second and third determine the grade. If you can only recite definitions, you will struggle as soon as the follow-up comes.

How to prepare: speak, do not just read

The biggest mistake is preparing for an oral exam like a written one: reading notes, summarizing, highlighting. In the exam you need to retrieve knowledge and formulate it on the spot. Practice exactly that.

Start three to four weeks before the exam. Make a list of all topics and write three to five likely questions per topic, from easy to hard. Then answer them aloud, without notes, ideally while recording yourself. Listen back and check: Was the answer correct? Was it structured? Did you get to the point within 30 seconds?

Write a one-page topic map that shows how the main topics connect
Prepare a 2-minute answer for each “Tell me about …” question
Explain each topic aloud from memory at least three times on different days
Do at least two mock exams with a classmate, tutor or friend who asks follow-up questions
Prepare a short opening (2–3 minutes) for any topic you may choose yourself

Preparing for a UK viva voce

A PhD viva usually has an internal examiner from your university and an external examiner from another institution; sometimes an independent chair is present. Both have read your thesis carefully. The viva is not a lecture but a scholarly conversation about your work.

Re-read your thesis about two weeks before and mark key pages with sticky tabs. Write a one-page summary per chapter. Prepare answers to the classic questions: What is your original contribution? Why did you choose this method? What would you do differently? How does your work relate to [a key author]? What are the limitations? Also check papers published since you submitted.

Typical outcomes include pass without corrections, pass with minor corrections, major corrections, resubmission or, rarely, award of a lower degree. The exact categories and deadlines are set by your university’s regulations, which take precedence.

Techniques for answering during the exam

Structure is your best friend. Start with a one-sentence answer, then explain, then give an example. Examiners value clear thinking more than speed.

Take two seconds to think before answering; it looks confident, not slow
Structure aloud: “There are three main reasons. First …”
Use concrete examples, numbers or cases to show real understanding
If you did not understand the question, ask: “Do you mean … or …?”
If you do not know, say so and reason aloud: “I’m not sure, but based on … I would expect …”
Stop when you have answered; long monologues invite tricky follow-ups

Dealing with nerves in oral exams

Nervousness is normal and examiners expect it. A racing heart and dry mouth do not mean you will perform badly. What helps most is familiarity: the more often you have answered questions aloud under some pressure, the less threatening the real situation feels.

On the day, arrive early, bring water and breathe slowly before you go in. If your mind goes blank, say so calmly and ask for a moment, or start with what you do know about the topic. If you have a documented condition such as an anxiety disorder or a speech impairment, contact your disability or accessibility service well in advance. Possible accommodations, such as extra time or a different format, depend on your university’s regulations.

Frequently asked questions

How do I prepare for an oral exam?

List all topics, write likely questions, answer them aloud from memory on several days, and do at least two mock exams with someone who asks follow-up questions.

What is a viva voce?

An oral examination, best known as the final oral exam of a PhD in the UK, where internal and external examiners discuss your thesis with you.

How long is a PhD viva?

Commonly about one and a half to three hours, though it can be shorter or longer. Length says little about the outcome.

What if I don’t know the answer in an oral exam?

Say so honestly and show how you would approach the question, using related knowledge. Examiners value reasoning; bluffing usually leads to harder follow-ups.

Can I choose the first topic in an oral exam?

Often, yes, especially in oral module exams. Prepare a 2- to 3-minute opening on a topic you know well, and expect follow-up questions on it.

Sources and further reading

Roediger, H. L., & Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249–255.
Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving students’ learning with effective learning techniques: Promising directions from cognitive and educational psychology. Psychological Science in the Public Interest, 14(1), 4–58.

Your university’s examination regulations and style guide always take precedence.