Common MRCPsych CASC mistakes are usually simple and repeated: you answer the station you hoped for rather than the one written, you sound polished but not responsive, you undercook risk, or you give a management plan that is generic rather than safe and person-centred. In a 16-station exam with short preparation windows, those errors snowball.
Why common MRCPsych CASC mistakes matter
At the moment, RCPsych describes the CASC as two circuits completed on the same day: a morning circuit with four minutes' reading time and seven minutes' task time, and an afternoon circuit with 90 seconds' reading time and seven minutes' task time. The current structure is 16 stations: 5 history taking, 5 examination and 6 management.
To pass, you need both the total borderline regression score and a passing score in at least 12 stations. Examiners are judging more than factual recall: the College frames performance around professional attitude and behaviour, consultation management, communication skills, applied clinical knowledge, clinical assessment skills and clinical management skills.
That means the candidate who is "nearly there" often loses marks through repeated technique errors, not one dramatic collapse.
Missing the task in front of you
RCPsych says station instructions set the scene and then give explicit task instructions in bold bullet points. Sometimes there are negative instructions telling you what not to do. A common failure is to read the scenario but not the command.
Before you enter, force yourself to answer four questions:
- What exactly am I being asked to do?
- Who am I speaking to: patient, relative, colleague or examiner-style prompt?
- What am I not being asked to do?
- What must be clear by the end of minute six?
A worked example helps. If the task is to explain likely emotionally unstable personality disorder to a patient's sister and discuss next steps, do not spend half the station retaking trauma history. Name the problem carefully, acknowledge uncertainty where it exists, explain risk and support, and finish with a practical plan.
Sounding rehearsed instead of clinically responsive
Role players are trained to respond to what you do. The College explicitly notes that a rude or abrupt candidate may be met with irritability or hostility, and its communication criteria emphasise active listening, response to verbal and non-verbal cues, appropriate questioning and clear language without jargon.
This is where over-rehearsal backfires. If every difficult relative gets the same empathy sentence, or every depressed patient gets the same risk script, you stop sounding like a psychiatrist and start sounding like a checklist.
A better approach is to build flexible phrases, not fixed speeches. For example:
- "You've told me the voices are worst at night. Can I check what happens then?"
- "I can hear that your main worry is going home alone. Let's deal with that first."
- "Before I go on, can I check what you've understood so far?"
Examiners usually forgive a slightly plain phrase. They do not forgive missing the cue.
Treating empathy, personalisation and culture as optional extras
The current syllabus mapped to the 2022 core psychiatry curriculum includes communication subdivisions for personalisation and respect, responding to cues, empathy and giving clear information, with emphasis stations in the blueprint. It also expects inclusive, person-centred consulting that recognises communication needs, diversity, cultural and spiritual context, and the impact of inequalities.
So the mistake is not just "poor bedside manner". It is failing an assessed part of the exam.
In practice, this means you should stop talking about "the schizophrenic" or "the borderline patient" and start talking to the person in front of you. If a 24-year-old asylum seeker is describing trauma symptoms, the station is not improved by a generic PTSD monologue. It is improved by checking safety, understanding, language needs, cultural meaning, practical stressors and what matters to that individual now.
Superficial risk assessment and vague safety planning
Risk is not a side issue. The College says candidates must identify high-risk issues, explore risk systematically and deeply enough to produce an adequate management plan, and the blueprint requires at least one risk assessment or safety planning station in every running order.
The classic weak performance is a thin risk screen: "Any suicidal thoughts? Any plans?" Then moving on. In CASC, risk needs shape and consequence.
A simple structure is to cover:
- nature of the risk
- immediacy and intent
- frequency and recent change
- triggers and protective factors
- access to means or opportunity
- impact of substances, psychosis or impulsivity
- risks to others, dependants or vulnerable adults where relevant
- what you will do today because of that risk
If you uncover serious risk, say what follows from it. A risk assessment without an action plan is only half an answer.
Generic management that isn't safe, coherent or feasible
Management stations fail when the answer sounds like a textbook list rather than a safe plan for this patient, today. RCPsych says management should be evidence-based, safe, coherent, feasible and aligned with current UK best practice, with attention to risk plus biological, psychological and social interventions.
A reliable way to structure management answers is now, next, later.
- Now: immediate safety, physical health concerns, observation level, capacity or consent issues, urgent collateral, and whether a legal framework may be needed.
- Next: medication, psychological work, nursing or MDT input, family or carer involvement, substance use work, and relevant investigations.
- Later: follow-up, relapse prevention, community supports, psychoeducation and contingency planning.
A 67-year-old with severe depression and poor intake needs more than "start an antidepressant and offer therapy". A better answer states what happens today, who reviews physical state, how risk is managed, when family are involved, and what follow-up looks like.
Ending without a summary or shared plan
Candidates often speak until the bell and never land the station. Yet the College's consultation and communication criteria specifically mention making sure the role player has understood the issues raised, using summary where helpful, and giving clear and accurate information about assessment, treatment and management.
Your last 20 to 30 seconds matter. A strong close usually includes three moves: brief summary, immediate plan, check understanding.
For example: "From what you've told me, I'm concerned you're becoming severely depressed again and that your thoughts of self-harm have worsened this week. My immediate plan is to keep you safe today, involve the duty team, and make sure we don't send you home with this level of risk. How does that sound to you?"
That sounds organised. And safe.
Common mistakes to avoid
- answering beyond the task and running out of time
- using a memorised script instead of reacting to cues
- giving empathy lines without actually changing your approach
- doing a superficial risk screen with no resulting plan
- forgetting physical health, capacity, safeguarding or legal issues when the stem points that way
- giving broad management lists without saying who will do what, when, and why
- using jargon with patients or relatives
- finishing the station without a summary, safety-net or check of understanding
Practice workflow for your next mock viva
Your mock viva practice should mirror the real timing. Use some stations with four minutes of reading time and some with 90 seconds, because the current format uses both.
A practical weekly routine looks like this:
- run two timed practice sessions each week
- do 4 to 6 stations per session, not 15 exhausted ones
- ask one partner to mark only task focus and closure
- ask another to mark only empathy, cues and flow
- record at least one station and watch it back the same day
- after each station, write down one omission, one wording fix and one better prioritisation choice
If you've had a previous unsuccessful attempt, squeeze value out of the College feedback. RCPsych says unsuccessful candidates receive formative feedback, and after a June 2026 update it also made the generic feedback statements and explanations available on the CASC preparation page for all candidates.
One extra tip: practise rescue lines for when you drift. Short phrases such as "Let me summarise where I've got to" or "The most immediate issue here is risk" can recover a station before it unravels.
Summary
- Most common MRCPsych CASC mistakes are technique errors repeated across stations, not obscure knowledge gaps.
- Read the command, not just the scenario.
- Be responsive: follow cues, adapt your language, and sound like you're in a real consultation.
- Risk and management answers need consequences, not just lists.
- Finish cleanly with a summary, plan and check of understanding.
References
- https://www.rcpsych.ac.uk/training/exams/preparing-for-exams/preparing-for-the-casc
- https://www.rcpsych.ac.uk/docs/default-source/training/examinations/casc-syllabus-march-2023.pdf?sfvrsn=1fe04f2b_4
- https://www.rcpsych.ac.uk/training/exams/exams-news-and-updates
- https://www.rcpsych.ac.uk/training/exams/faqs-about-preparing-for-exams
- https://www.rcpsych.ac.uk/docs/default-source/training/examinations/exams-eligibility-criteria-and-regulations---may-2025.pdf
- https://www.rcpsych.ac.uk/training/exams/applying-for-your-exam/apply-to-take-casc