PassMedicine is an inexpensive, high-volume option many emergency-medicine trainees use as a core bank for the MRCEM SBA — and, as with its other exams, its dashboard measures how you are performing inside the app rather than whether you are ready for the RCEM paper. This audit is for candidates deciding how far to trust the numbers. The principal limitation: a self-directed practice loop rewards the domains you choose, and the RCEM curriculum's SLO weighting does not care what you chose to revise.
What PassMedicine offers for MRCEM SBA right now
PassMedicine sells low-cost fixed-term MRCEM access on its standard model — a large single-best-answer bank, revision and timed modes, textbook notes and peer-comparison analytics; it does not advertise an LLM tutor or a machine-learning adaptive engine, so the "engine" is the practice loop you configure. Verify the current MRCEM SBA question count and price on the product page (its MRCP product lists 5,100+ questions at £35 for four months for calibration). At this price the value is real; this audit is about reading the dashboard honestly.
The exam the numbers must answer to
The MRCEM SBA (the Intermediate SBA) is 180 single-best-answer questions delivered in two 120-minute papers of 90 questions each, mapped to the 2021 RCEM curriculum across Specialty Learning Outcomes 1 and 3–7. The published domain distribution is the anchor for every revision decision: Complex Stable Patient 55, Resuscitation 40, Injured Patient 30, Paediatric Emergency Medicine 25, Procedural Skills 20, and Complex/Challenging Situations 10. Pass rates typically sit around 45–50%, so margins are real. Candidates must have passed MRCEM Primary; the OSCE follows.
What each metric actually measures
First-attempt accuracy on unseen items is the only number that behaves like the exam. Repeat accuracy rises with exposure regardless of learning. The peer percentile compares you with a self-selected population at every stage of preparation — motivation, not a pass forecast. Coverage counts attempts, the raw material for the curriculum audit. Difficulty and time-per-item are diagnostic per domain, and pacing matters here: 90 questions in 120 minutes is 80 seconds an item, so accurate-but-slow is a real failure mode. What no bank shows is transfer — whether you can answer an unseen question on the same concept phrased differently — which a separate unseen source measures best.
Selection bias: why your percentage flatters you
Any loop that lets you choose what to answer produces biased statistics. Practise your strong domains and your average inflates; drill your weak ones and it deflates against other people's mixed samples; repeat previously wrong questions and repeat accuracy climbs while telling you nothing about the exam. Any percentage produced under conditions you chose is not comparable with a mixed, unseen, timed block, and only the latter resembles the SBA. This is the standing argument of Your Q-Bank Percentage Is Not Your Exam Score.
Audit your distribution against the SLO weighting
Once a fortnight, set your attempted-question distribution against the RCEM domain weighting above. The Complex Stable Patient domain is the largest single block (55 of 180), and resuscitation and the injured patient together are another 70 — so an emergency trainee who over-practises the resuscitation adrenaline and under-practises the complex stable patient is misaligned with the exam. Paediatric emergency medicine (25) is a common blind spot for adult-heavy rotations, and procedural-skills knowledge (20) is easy to neglect. Read your distribution against the weighting, not the home-screen average.
What a credible readiness signal requires
Five conditions, all of them: unseen questions, timed at exam pace (about 80 seconds per item), mixed across the SLO domains, no assistance, and a sample of 100+ questions across multiple sittings. Any bank mocks run under timed conditions are the most exam-like signal inside the product; filtered revision, by design, is not.
When to override the selector
Force the Complex Stable Patient domain to its blueprint share even if resuscitation feels more like "real EM". Force paediatric emergency medicine on a rota, because adult-weighted practice under-samples it. Force procedural-skills and imaging items if your mix lacks them. And force full-pace mixed blocks weekly, because the exam is indifferent to what you felt like revising.
A worked dashboard example
Suppose after four weeks: overall 68%; resuscitation strong at 74% over 300 attempts; complex stable patient 60% over 180; paediatric EM 55% over 70; procedural skills 20 attempts; pace 88 seconds per item. Read properly: resuscitation is over-practised relative to its 40-mark share and can be maintained; the complex stable patient is the largest domain (55 marks) and under-performing, so it takes the largest quota; paediatric EM is thin and weak; procedural skills is nearly a blank spot; and pace at 88 seconds will not finish the paper, so three timed blocks target the 80-second budget. Next week is quotas, not a pass prediction.
A seven-day pattern for busy trainees
Monday: 40 PassMedicine questions in the complex-stable-patient or paediatric-EM domains, explanations read. Tuesday: 30 more plus error review. Wednesday: a timed, unseen 50-question mixed block in iatroX's free MRCEM SBA bank for a first-attempt signal across the SLO domains. Thursday: rest or 20 light questions. Friday: 40 questions on the blueprint domains your audit flagged, timed at 80 seconds each. Saturday: a mock or a second mixed block, reviewed same day by error type. Sunday: spaced review of the week's errors. PassMedicine does volume and explanations; iatroX does unseen transfer measurement across the SLO domains.
Continue, supplement, switch or stop
Continue while unseen mixed performance is rising and your SLO audit is roughly level. Supplement (with unseen mixed blocks and transfer practice) if PassMedicine's numbers rise while unseen performance stalls. Switch only for a measurable gap — a domain covered thinly for you, or analytics you cannot get. Stop question-grinding and move to mock conditions in the final fortnight when coverage is complete, first-attempt accuracy is stable and pacing is on target — bank completion is not an exit criterion.
A worked dashboard example
Suppose after four weeks of MRCEM SBA practice PassMedicine shows: overall 68%; resuscitation strong at 74% over 300 attempts; complex stable patient 60% over 180; paediatric emergency medicine 55% over 70; procedural skills 20 attempts; pace 88 seconds per item. A candidate reading "68% and improving" keeps drilling the resuscitation scenarios that feel most like emergency medicine. The audit reads it against the SLO weighting and produces a different plan. Resuscitation is over-practised relative to its 40-mark share and can be maintained with one small block. The Complex Stable Patient domain is the largest single block on the paper — 55 of 180 marks — and under-performing, so it takes the largest quota. Paediatric emergency medicine (25 marks) is thin and weak, a common blind spot for adult-heavy rotations. Procedural skills (20 marks) is nearly a blank spot. And pace at 88 seconds will not finish 90 questions in 120 minutes, so three timed blocks target the 80-second budget. Next week is quotas, not a pass prediction.
Why the SLO weighting matters more than it feels like it should
Emergency trainees are drawn to resuscitation practice because it is the vivid, high-adrenaline core of the specialty — and the SBA blueprint deliberately weights the less dramatic Complex Stable Patient domain highest, at 55 marks, with resuscitation at 40. A preparation that follows enthusiasm rather than the blueprint therefore over-invests in resuscitation and under-invests in the largest scoring domain, which is exactly the misalignment the audit exists to catch. The same pattern applies to paediatric emergency medicine, which adult-weighted rotations under-sample, and to procedural-skills knowledge, which is easy to neglect because it feels peripheral to clinical reasoning. Reading your attempted distribution against the published SLO weighting — not against what feels like real emergency medicine — is the single most valuable audit habit for this exam, and it is the one a home-screen average actively obscures.
Frequently asked questions
Is PassMedicine enough for MRCEM SBA on its own? Its volume, price and explanations can carry the bulk of preparation, but it cannot measure performance on unseen, mixed, timed material, so add independent mock-condition practice and treat its dashboard as practice data.
Which MRCEM SBA component does PassMedicine not reproduce well? The exam's SLO-weighted breadth under unseen timed conditions — especially the large Complex Stable Patient domain and paediatric emergency medicine, which self-directed practice tends to under-sample relative to resuscitation.
How many PassMedicine questions should I complete per day for MRCEM SBA? 40–60 on weekday study days and 80–100 on a weekend day, distributed by the SLO weighting rather than by comfort, with two timed mixed blocks weekly at the 80-second-per-item pace.
When should I stop using PassMedicine and move to mixed mocks? When every SLO domain is attempted above your floor, first-attempt accuracy is stable across two weeks, and pacing sits at or under 80 seconds per item — usually the final three to four weeks.
How should I combine PassMedicine with iatroX without duplicating practice? PassMedicine for SLO-directed domain drilling and explanations; iatroX (free for MRCEM SBA) for unseen timed blocks and adaptive selection across the SLO domains — so your readiness signal comes from questions neither you nor your history selected.
The bottom line for busy trainees
The honest one-line verdict on PassMedicine for the MRCEM SBA: an inexpensive, high-volume core bank whose dashboard measures your practice, not your readiness — with a specialty-specific twist worth naming. Emergency trainees gravitate to resuscitation practice because it is the vivid core of the specialty, and the SBA blueprint deliberately weights the less dramatic Complex Stable Patient domain highest, at 55 of 180 marks. So the audit that matters most is your attempted distribution against the SLO weighting, not the home-screen average — force the largest domain and the under-sampled paediatric and procedural content, and time your practice to the 80-seconds-per-item budget the two-paper format demands. Buy PassMedicine for its volume and explanations, read its numbers as practice data, and let an unseen source measure transfer across the SLO domains, and it is a strong core; follow your enthusiasm for resuscitation and its healthy percentage will conceal thin coverage of the domain that carries the most marks.
Editorial notes and references
Written by Dr Kolawole Tytler, NHS GP and founder of iatroX. Last checked 19 July 2026; PassMedicine details are vendor-published — verify MRCEM SBA counts and price before purchase. MRCEM SBA format (180 SBA in two 120-minute papers; 2021 RCEM curriculum SLOs 1, 3–7; domain weighting) is per RCEM. Disclosure: iatroX operates a free competing MRCEM SBA bank. Corrections via the feedback route on iatrox.com. References: RCEM MRCEM exam and curriculum pages (rcem.ac.uk); PassMedicine product pages; related reading: why your Q-bank percentage is not your exam score.