NMC CBT Part A Numeracy: A Complete Guide for International Nurses
What Part A actually is
The NMC Test of Competence CBT for internationally trained nurses registering in the UK has two parts, sat in one sitting: Part A is numeracy — 15 calculation questions in 30 minutes — and Part B is clinical knowledge. You must pass both, and Part A demands a very high accuracy bar, so a single careless conversion can be the difference.
The calculations themselves are not exotic: drug dosages, infusion rates, unit conversions, and fluid volumes, all in SI units. What catches candidates is pace pressure plus the zero-tolerance marking — this is a test of reliability, not advanced mathematics.
SI units only — retrain your defaults
UK practice is fully metric: micrograms, milligrams, grams; millilitres and litres; kilograms. If you trained somewhere that uses grains, ounces, or household spoons in exam questions, drop them from your practice entirely — they will not appear, and practicing them wastes reps.
One UK-specific convention worth internalising: "micrograms" is written out in full on prescriptions rather than abbreviated, precisely because mcg/mg confusion is the most dangerous error family in dosing. The exam expects you to be fluent moving across the mcg→mg→g ladder in both directions.
Our practice app has a dedicated NMC CBT mode that filters the question bank to metric-only questions for exactly this reason.
The question types to drill
Tablet and liquid doses via desired-over-have: an order in mg, stock tablets or solution at a labelled strength, answer in tablets or mL. Infusion rates in mL/hr from volume and duration. Weight-based doses at mg/kg. Percentage and ratio solutions appear occasionally but the core four families cover the great majority of papers.
Practise at exam pace early: 15 questions in 30 minutes is two minutes each, which is generous — until checking is included. Aim to solve in 60-90 seconds so every answer gets a second pass. The pass standard punishes the unchecked slip, not the slow solver.
A two-week preparation plan
Days 1-7: untimed daily drills across all four families, writing full setups with units. Log every error by type. International candidates typically find one systematic gap — often mL/hr rounding conventions or the mcg ladder — and one week of targeted reps closes it.
Days 8-14: timed mixed sets at 90 seconds per question, finishing with full 15-question mock papers at 100% target. If you are missing one question per paper, identify whether it is knowledge or checking discipline — the fix differs. Walk in having repeatedly scored perfect papers under time, and Part A becomes an administrative step rather than a hurdle.