What is an MMI?

The format, described plainly

An MMI is a circuit of stations. A student stands outside a station, reads a short prompt on the door, and waits for a signal. When the signal goes, they enter, deal with whatever is inside for a fixed number of minutes, and then a bell or buzzer moves them on to the next station. They keep going until the circuit is finished.

Station numbers and timings vary between schools. Some run short stations with a large number of them, some run fewer and longer. Do not assume the format your neighbour's daughter sat is the one your son or daughter will sit. The invitation email, or the admissions page for that specific school, is the only source worth trusting.

Each station is scored by its own assessor against its own criteria. Nobody at station six knows that station two went badly. This is the single most important structural feature of the format and I will come back to it.

What is inside a station

Stations are not all questions. A circuit usually mixes several types of task, and a student who has only rehearsed answering questions will be caught out by the ones that are not questions.

Some stations are conversational: why medicine, why this school, tell me about something you learned from work experience. Some are ethical scenarios, where a situation is described and the student is asked what they would consider. Some are role play, where an actor plays a patient, a relative or a fellow student, and the student has to have a difficult conversation. Some are data or calculation stations. Some are task stations, where a student instructs someone to do something they cannot see, and the marks are for the clarity of the instructions rather than the outcome.

In a role play station the actor is often marked too, or at least asked for a view. The actor is not there to be defeated. They are there to give the student something to respond to, and the response is the thing being assessed.

What assessors are actually scoring

I used to sit on the other side of the table, and the mark sheet is duller than students imagine. It is not looking for brilliance. It is looking for evidence of specific, listed behaviours, and it usually has a small number of domains with a short descriptor for each.

Broadly, an assessor is asking: can this person communicate clearly with someone who is not a doctor; do they listen and respond, or do they deliver a speech; do they show insight into other people's positions; can they hold two competing considerations in mind without collapsing into a slogan; do they behave with integrity when the easy answer is available; and would I be comfortable with them near a patient in four years' time.

Notice that none of those is knowledge. Students spend weeks learning facts about the NHS structure and then lose marks because they talked over an actor who was upset. Knowledge earns you the right to be in the room. Behaviour earns the score.

Why the reset between stations matters so much

Because each station is scored independently, a bad station is contained. It cannot spread unless the student carries it. The students who do badly overall are very often students who had one poor station and then spent the next three replaying it.

I teach a deliberate reset. Between stations there is a short walk and a prompt to read. That time belongs to the next station, not the last one. Read the prompt twice. Decide what is being asked. Notice one thing about the room when you walk in. It sounds trivial and it is the difference between one weak station and four.

The most common mistakes

The first is not answering the question on the door. Students prepare material and then look for a place to put it. If the prompt asks what considerations are relevant, and the student delivers a rehearsed passage about their work experience, the assessor has nothing to tick.

The second is talking for the full time because the time exists. A clear, complete answer that finishes early is stronger than a padded one. Silence at the end of a station is allowed. Filling it with repetition is where good answers go to die.

The third is treating role play as a debate. The actor says something difficult, and the student explains why the actor is wrong. Almost every role play station rewards acknowledging the other person's position before doing anything else. Students who cannot do that in a station will not do it with a patient.

The fourth is giving the ethically correct conclusion with no reasoning. I will write about this separately, because it is the single biggest source of unfairly low scores among clever students. The assessor is marking the thinking, and a conclusion with no route to it is unmarkable.

The fifth is over rehearsal. A scripted answer sounds like a scripted answer. It also breaks completely when the question is phrased slightly differently, which it will be.

How to prepare for the format itself

Practise standing up, reading a prompt under time pressure, and starting cold in front of someone unfamiliar. Practising sitting at a kitchen table with a parent who loves you does not reproduce any part of the experience that makes it hard.

Practise in circuits rather than single questions. Stamina is real. The quality of a student's answers at station eight is usually noticeably lower than at station one, and the only fix is having done it before.

Get feedback from someone who has marked interviews, not just someone who has sat them. A student can be told they were fine by three friends and still be missing the one habit that is costing them a domain in every station.

Finally, prepare thinking rather than answers. The categories of question recur. The exact wording does not. A student who has a way of approaching an ethical scenario will handle a scenario they have never seen. A student with forty memorised answers will handle the forty they memorised.