Most mock vivas end with the same useless sentence. “You did really well, you’re going to be fine.”
You smile, you say thank you, and you walk away with absolutely nothing you can use. Here’s the thing. The problem isn’t usually the student. It isn’t usually the examiner either. The problem is that nobody briefed the examiner on what to listen for. So they listened for the wrong things, and you got the wrong feedback.
I’ve noticed this pattern over and over. The students who get the most out of a mock viva aren’t the ones who memorise their thesis cover to cover. They’re the ones who turn the mock into a diagnostic tool. They prepare for it the way a pilot prepares for a simulator run, and they brief the examiner the way a researcher briefs a peer reviewer.
A mock viva is not a performance to pass. It is a diagnostic instrument you operate on yourself.
Most students have to ask for a mock viva in the first place because their department didn’t offer one. That’s a structural gap, and it isn’t your fault. But it does mean the responsibility for making the mock useful sits with you. Here’s how to make sure it’s worth the hours.
Before the mock: read with fresh eyes, not panicked ones
Re-read your thesis once.
The goal isn’t to memorise. It’s to remind yourself what’s there, in what order, and where the joins between chapters are. If you reread three times in a fortnight you’ll only sharpen your anxiety, not your recall. One careful pass, with a pen in hand, marking the places that make you wince.
Then build a one-page contribution summary you could recite in the shower. Three sentences on what the thesis claims, three sentences on how it gets there, and one sentence on why it matters. If you can’t say this without notes, you can’t say it under pressure.
Next, list the three weakest parts of your thesis. The parts you’re hoping they won’t ask about. The reality is that they will. Examiners are drawn to soft spots the way water finds cracks. Naming them in advance turns ambush into rehearsal.
Prepare your answer to the opening question. Some version of “tell me about your thesis in a few sentences” almost always comes first. It sets the pace and the tone of everything that follows. Practise it out loud until it feels conversational, not recited.
Finally, identify your “limits of the study” paragraph. Examiners love probing this. They want to see whether you understand what your work doesn’t do, not just what it does. If you can articulate the limits with calm confidence, you signal that you’re a researcher, not a defender.
During the mock: treat it like the real thing
Dress for it. Set up the room or the Zoom window the way you’ll set it up on the day. No notes except your thesis itself, tabbed if you must, but closed in front of you.
Give yourself permission to pause before answering. A two-second pause is invisible to the examiner and feels like an hour to you, which is exactly the calibration you need. Practise saying “that’s a good question, let me think for a moment”. It’s a complete sentence. It buys you the room to think instead of filling the air with the first thing that comes into your head.
When you don’t know something, say so cleanly. “I haven’t considered that angle. My instinct would be X, but I’d want to look at Y before committing.” That’s the answer of someone who has earned a doctorate. Bluffing is the answer of someone who’s afraid of being found out.
Bring a notebook. Better still, bring two. One for you to scribble in, and one for the examiner. Ask them to take notes on your behalf as the conversation unfolds. Future-you, sitting in front of the real examiners in three weeks, will thank present-you for this. The notebook becomes a record of where you stumbled, what phrases worked, and what questions surprised you. You can’t reconstruct all of that from memory afterwards.
The feedback ask: brief the examiner before you start
This is the part few do, and it’s the part that decides whether your mock was worth the time.
Most mock vivas produce vague reassurance because the examiner wasn’t told what kind of feedback you needed. Tell them. Before the mock starts, send them this list and ask them to listen for it as you go. It changes their attention from “is this person likely to pass” to “what would help this person improve”. Two completely different forms of listening.
Ask for these seven things, by name, before the mock begins:
- Which answers felt rehearsed, and which ones felt like I was thinking? You want to know where your performance is masking your reasoning. Rehearsed answers collapse the moment a real examiner pushes sideways.
- Where did you want to interrupt me, and why? Interruptions are diagnostic. They mean you went on too long, or missed the actual question, or said something that needed challenging. You need to know exactly where.
- Which chapter did I defend weakest? Not which is the weakest chapter. Which one did I defend least convincingly. They aren’t always the same thing.
- What question do you wish you’d asked that you didn’t? This catches the soft spots the examiner saw but didn’t have time to test. Those are the ones a real examiner will reach for.
- How did I handle the questions I didn’t know the answer to? This is one of the most-tested skills in a viva and one of the least-prepared. You want a plain assessment of how you behave when you’re stuck.
- Was there a moment you lost confidence in my expertise? When? A brutal question. Worth asking. Confidence is built through specifics, not pep talks, and you need to know which specific moment broke the spell.
- What would you press me on if this were the real viva? This converts the mock into a forecast. You walk away with a list of probable lines of questioning, not a vague good luck.
Write the answers down as they come. Don’t argue with them. Don’t explain. Just listen, ask follow-up questions if you need clarification, and thank them.
Afterwards: treat it as data, not a verdict
A mock viva isn’t a pass or a fail. It’s a snapshot of where you are right now, two or three weeks before the real thing. Some of what you hear will sting. Most of it will be more useful than the version your supervisor gave you, because you briefed for it.
Look at the seven answers together. Patterns will surface. You’ll see which chapters need another pass, which kinds of questions throw you, and which habits you fall into when you’re cornered. That’s your revision plan for the final stretch, written for you by someone who saw you under pressure.
If your department didn’t offer a mock viva, or if the one they offered was the vague-reassurance kind, our mock viva service runs the same format described here, with examiners who know how to give the feedback you can use.
If you want to go deeper on the format itself, we’ve written a walk-through of what happens in a PhD mock viva and the five differences between a mock and the real thing. For question prep, our list of common viva questions to prepare for is a good companion to this piece, and the broader guide to impressing the examiners covers the longer arc.
What’s the one question you most don’t want to be asked in your viva? That’s the one to rehearse first.
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