MNB/LJM Nursing Examination common mistakes
MNB/LJM Nursing Examination · Understand the traps and how to avoid them.
Choosing an answer because it sounds compassionate or patient-centred rather than because it is the safest action the nurse is licensed to perform independently, e.g. selecting 'stay with the client and reassure them' when the client is deteriorating and the correct action is to call for help or initiate the emergency response.
Candidates are trained to value empathy and often equate 'caring' with 'correct'. Under exam pressure, the emotionally warm option feels right, and candidates forget that priority questions are scored on physiological safety and scope of practice, not on bedside manner.
What to do instead
Before answering any priority or 'first action' item, apply a fixed triage filter: ABC (airway, breathing, circulation) first, then neurological status, then safety, then comfort and communication. Ask 'does this option prevent death or harm in the next few minutes?' If not, eliminate it. Practise by rewriting each stem as 'what will kill or harm this client soonest?' and choosing that action, then checking whether the option is within RN scope.
Applying adult vital-sign and assessment norms to infants and children, for example treating a respiratory rate of 50 in a 6-month-old as abnormal tachypnoea, or expecting a toddler's heart rate to be 60-100.
Most revision material and clinical exposure is adult-focused, so adult reference ranges become the default mental template. Candidates also memorise a single paediatric range without age-banding it, and exam items deliberately use age-specific values to test this.
What to do instead
Build and memorise an age-banded table (newborn, 1-11 months, 1-2 years, 3-5 years, 6-11 years, 12+ years) for respiratory rate, heart rate and blood pressure, and rehearse it weekly. For every paediatric item, first write the child's age and the expected range in the margin, then compare. Also memorise the paediatric early-warning red flags: grunting, nasal flaring, intercostal recession, lethargy, poor feeding, and apnoea in infants.
Confusing therapeutic drug monitoring with routine monitoring: measuring a peak level at the wrong time, drawing a trough after the dose, or failing to hold a drug before drawing a level when the protocol requires it.
Candidates learn that drugs such as vancomycin, gentamicin, digoxin and phenytoin 'need levels' but do not learn the timing rules, which differ by drug and by institution. Exam items exploit this by offering plausible but wrong sampling times.
What to do instead
Create a one-page table with columns for drug, therapeutic range, when to draw peak, when to draw trough, and which drugs require the dose to be held before sampling. Anchor the common rules: troughs are drawn immediately before the next dose; peaks are drawn a defined interval after the end of the infusion (commonly 30 minutes for vancomycin, 30-60 minutes after a 30-minute gentamicin infusion); digoxin levels are drawn at least 6-8 hours after the dose. Rehearse with timed scenarios rather than drug names alone.
Treating delegation as task-sharing: delegating assessment, teaching, evaluation, or an unstable client's care to an unlicensed assistive personnel or practical nurse, or delegating without specifying what to report back and when.
In practice, experienced nurses delegate flexibly and informally, and candidates import that habit into the exam. They also conflate 'who is available' with 'who is permitted', and forget that the RN retains accountability for the five rights of delegation.
What to do instead
Memorise the non-delegable RN functions: initial assessment, nursing diagnosis, care planning, client teaching, evaluation of outcomes, and any intervention on an unstable client. For every delegation item, check the five rights (task, circumstance, person, direction/communication, supervision) and require that the option names the task, the client, the time frame, and the expected report. Eliminate any option that delegates a non-delegable function even if it is efficient.
Mixing up transmission-based precautions and PPE doffing order, for example using alcohol hand rub after caring for a client with Clostridioides difficile, or removing gloves after the mask when doffing.
Precautions are taught early and revised rarely, so details decay. Candidates remember 'wash hands' but not that spore-forming organisms require soap and water, and they rehearse donning far more than doffing.
What to do instead
Memorise the precaution matrix by organism and by route (contact, droplet, airborne) with the specific additions: soap and water for C. difficile and norovirus; N95 with fit check for airborne; eye protection for droplet-generating care. Practise doffing in a fixed verbal sequence every time: gloves, then goggles/face shield, then gown, then mask/respirator, with hand hygiene after glove removal and at the end. Write the sequence out from memory weekly until it is automatic.
Answering legal and ethical items with personal morality or workplace custom instead of the statutory framework, for example disclosing information to a family member who asks 'because they are next of kin', or accepting a verbal order for a restricted drug.
Candidates have limited exposure to legislation and rely on what their clinical area does, which may not reflect the law. Confidentiality, consent, mandatory reporting and scope of practice are also genuinely counter-intuitive in edge cases.
What to do instead
Learn the legal tests as decision rules: capacity and informed consent (who can consent, when a minor can consent, emergency exception), when confidentiality may be breached (risk of serious harm, statutory notification, court order), and the reporting duties for suspected abuse, notifiable diseases and impaired practice. For any legal item, identify which statute or regulatory rule applies before looking at options, and eliminate options that require consent from someone who cannot legally give it or disclosure without a lawful basis.
Reading the stem once and selecting the first familiar-sounding option, missing qualifiers such as 'except', 'initial', 'priority', 'most likely', 'contraindicated', or a key assessment finding buried mid-stem.
Time pressure and exam anxiety drive fast pattern-matching. Familiar terms in a distractor trigger recognition, and the brain treats recognition as correctness, especially when the correct option is worded less memorably.
What to do instead
Adopt a mechanical routine for every item: underline the question's task word and any absolutes, restate the question in your own words in one sentence, then cover the options and predict the answer before reading them. Only then compare. If two options remain, re-read the stem for the qualifier that separates them. Budget roughly one minute per item and flag rather than rush items that need calculation.
Confusing grief, depression and delirium with each other, or labelling a client as 'non-compliant' or 'difficult' instead of assessing for an underlying physical or psychiatric cause.
Psychiatric presentations overlap, and candidates rely on surface behaviour. They also absorb stigmatising language from clinical environments and from everyday speech, and exam items reward neutral, cause-seeking assessment over judgement.
What to do instead
Learn the discriminating features as a comparison table: delirium (acute onset, fluctuating, impaired attention, often organic cause), depression (weeks to months, pervasive low mood, anhedonia, preserved orientation), grief (waves tied to loss, yearning, intact self-esteem). For any behavioural item, choose the option that assesses further or addresses a physical cause before the option that sets limits, medicates, or labels the client.
Mishandling medication calculations and unit conversions: mixing milligrams and micrograms, misplacing the decimal point, or using the wrong concentration when a drug is supplied in a different volume or as a ratio.
Calculations are rushed, done mentally, and rarely checked. Candidates also memorise formulas without practising unit conversion, and exam items use plausible distractors that differ only by a factor of ten or a thousand.
What to do instead
Use one written method every time (desired over have times volume) and show units at every step, cancelling them explicitly. Convert all values to the same unit before calculating. Estimate the answer first (does the volume look plausible for the dose?), then calculate, then re-check by back-calculation. Practise ten calculations daily under timed conditions, including paediatric weight-based doses, infusion rates in mL/h, and drop rates.
Applying adult medical-surgical reasoning to maternal and newborn items: missing that a postpartum haemorrhage is assessed by fundal tone and lochia before anything else, or interpreting normal newborn findings (moulding, milia, physiologic jaundice after 24 hours, pseudomenstruation) as pathology.
Maternal-newborn content is a small share of most curricula, so candidates revise it last and rely on adult analogies. Normal newborn physiology is genuinely unfamiliar and looks abnormal to an adult-trained eye.
What to do instead
Build a short, high-yield list for each phase: antepartum danger signs, the four T's of postpartum haemorrhage (tone, trauma, tissue, thrombin) with fundal massage as the first action, pre-eclampsia warning features, and normal versus abnormal newborn findings with timing rules (jaundice before 24 hours is always pathological). Rehearse newborn transition and feeding assessment separately from adult assessment so the two templates do not merge.