Most people prepare for interviews by reading questions and nodding along to their own answers in their head. That feels productive, but it skips the part that actually goes wrong on the day: saying the words out loud, under a little pressure, to someone who can react. Mock interview practice fixes that gap, as long as you set it up so it hurts a bit.
This guide is about how to practise, not what to prepare. If you still need to build your stories and research the employer, start with the interview preparation guide and come back once you have material to rehearse.
Pick the right partner for the job
Each type of practice partner is good at something different. Using the wrong one for the wrong purpose is the main reason mock sessions feel pleasant and change nothing.
A friend or partner is ideal for volume. They are free, available on a Tuesday evening, and you can run the same opening question six times without embarrassment. Their weakness is kindness: most friends will tell you an answer was "great" because they like you, not because it was.
Someone from your target field is the most valuable and the hardest to book. A data analyst friend-of-a-friend will spot in ten seconds that your SQL story sounds rehearsed or that you used the wrong term for a dashboard metric. Ask for 30 minutes, send the questions in advance, and offer to return the favour.
A paid coach makes sense when the stakes are high or you keep failing at the same stage. A good one gives structured, honest feedback and has heard hundreds of answers to compare yours against. Whether that is worth the fee depends on your situation; weigh the cost against how many interviews you actually have lined up.
A university or public careers service is often overlooked. Many offer free mock sessions to students, recent graduates or registered jobseekers. Quality varies, so ask who will run the session and whether they know your sector.
An AI practice tool is useful for repetition at odd hours. It will ask follow-up questions, never gets bored, and can give you a transcript to review. Treat its feedback as a first pass: it is good at flagging rambling or filler words, less reliable at judging whether an example would convince a hiring manager in your field.
Write a brief so your friend pushes back
The single biggest upgrade to practising with a friend is giving them a written brief. Without one, they improvise polite questions and accept whatever you say. With one, they have permission to be difficult.
A useful brief fits on one page:
- The job title, the company type and two or three lines from the job ad that matter most.
- Eight to ten questions, in the order you want them asked, with the three you dread marked clearly.
- A follow-up instruction: "After each answer, ask at least one 'why' or 'what exactly did you do' question."
- A permission line: "Interrupt me if I talk for more than two minutes. Do not tell me an answer was good unless you could repeat its main point back."
- A feedback sheet with two columns: what landed and what was vague.
Take Leila, preparing for a project coordinator role. Her brief told her flatmate to ask "What would your last manager say you are worst at?" and then follow up with "Give me an example of that happening." The second question was the one that exposed a weak spot, and she would never have asked it of herself.
Run it like the real thing
A mock interview only trains you for the real one if it resembles it. That means structure, a clock and no pausing to chat.
- Set the scene. Sit at a table, dress roughly as you would, and if the real interview is online, do the mock on a video call rather than across the sofa.
- Time it. Give the session a fixed length, usually 30 to 45 minutes, and keep the opening "tell me about yourself" under two minutes.
- Insist on follow-ups. The first answer is the one you rehearsed. The follow-up is the one that shows whether you understand your own story. If you use the STAR structure, the follow-ups test whether the Result part holds up; the STAR method explained covers how to build those answers.
- No feedback during. If your partner stops you after each answer to discuss it, you lose the experience of recovering from a weak answer and carrying on. Save every note for the end.
- Debrief straight after. Ten minutes, while it is fresh. Your partner reads their notes first, then you add what you felt went wrong.
Finish the debrief by choosing one or two things to change before the next round. A list of twelve improvements is a list you will ignore.
Record yourself on video
Watching yourself is uncomfortable, which is exactly why it works. A recording catches things neither you nor a friend notices in the moment.
Set your phone at eye level, record a full mock, and watch it back twice. The first time, watch with the sound off and look at posture, eye contact and what your hands are doing. The second time, listen without looking and note:
- How long your answers run. Many people discover their "short" answers are three minutes long.
- Filler words and restarts, especially at the start of each answer.
- Whether you actually answer the question asked or drift to a story you prefer.
- How your voice changes on the questions you dread.
Do not try to fix everything at once. Pick the most distracting habit and work on that one in the next session. If the recording shows a lot of physical tension, the techniques in the post on managing interview nerves are a better place to start than another rehearsal.
Know when to stop rehearsing
There is a point at which more mock interviews make you worse. You stop thinking and start reciting, and interviewers hear the difference. Answers lose the small pauses and specific details that make them sound true.
Signs you have hit that point:
- You can say an answer word for word, and you get thrown when a question is phrased differently.
- Your partner's feedback has been the same for two sessions.
- You feel flat rather than nervous going in.
When that happens, change the input rather than repeating the output. Ask a new partner, shuffle the questions, or practise answering a story from a different angle: what went wrong, what you would do differently, what the other person in the story would say. Knowing your material well enough to bend it is the goal, not reciting it perfectly.
For most roles, two or three proper mock sessions in the week before the interview is plenty. One with a friend for volume, one with someone from the field if you can get it, and a final short run on the day before to warm up.
A simple plan for this week
If you are wondering how to practice for an interview that is already on the calendar, keep it small and concrete. Write the one-page brief tonight. Book a 40-minute slot with a friend this week and a 30-minute call with someone in your target field the week after. Record the first session and watch it twice before the second.
Your CV is part of the material an interviewer will probe, so rehearse from the version they actually have. If you built it from your LinkedIn profile with Postulit, print that exact version and hand it to your mock interviewer along with the brief, so their questions come from the same page the real panel will read.