The Primary FRCA MCQ is a three-hour paper of 90 single best answer questions, and since September 2023 it has been single best answer throughout, the multiple true-false questions having been removed. It samples across the basic sciences that underpin anaesthesia: physiology with its associated biochemistry and anatomy, pharmacology, and physics with clinical measurement, statistics and data interpretation. Most candidates arrive competent in two of those and quietly hoping the third does not come up much. It does, and the third is almost always the physics.
Key takeaways
- The paper is 90 single best answer questions in three hours, with no negative marking and one mark per correct answer.
- Multiple true-false questions were removed in September 2023, so any resource still drilling them is out of date.
- Establish a separate baseline in each of the three sciences, because a blended percentage hides the weak one.
- Physics and clinical measurement is the domain candidates postpone, and it is finite and learnable.
- Most of this paper is derivable, so revise by deriving rather than by memorising.
Three sciences, three separate baselines
The first thing to do is stop treating this as one subject.
Physiology, pharmacology and physics are genuinely different bodies of knowledge with different reasoning styles, and candidates are rarely equally good at all three. Your overall percentage will be carried by your strengths, and it will conceal the domain that is going to cost you the exam.
So track three figures. Sample each domain properly, using Standard mode to drive the coverage rather than letting an adaptive engine narrow you prematurely, and record accuracy and exposure separately for each. Then set a target for each, and be honest about which one you have been avoiding, because it will be the one you find least congenial and the exam will not care.
The physics problem
Almost every anaesthetic trainee is comfortable with physiology and pharmacology, because both are recognisably medicine. Physics and clinical measurement is not, and it is the domain that gets pushed to next week, every week.
This is a mistake for a specific reason. Unlike physiology, which is effectively unbounded, the physics in this syllabus is finite. Gas laws. Flow, laminar and turbulent, and the factors that determine each. Pressure measurement. Vaporisers and how they work. Breathing systems and their efficiency. Humidification. Electrical safety. Monitoring principles, including how the pulse oximeter, the capnograph and the invasive pressure transducer actually work and what makes them lie. Ultrasound physics. The statistics and data interpretation that sit alongside.
That is a closed list, and it can be learned to completion in a way that cardiovascular physiology cannot. Its finiteness makes it the best return on your hours, and its unpopularity means most of your competitors will have half-learned it.
Derive, do not memorise
The Primary is a basic sciences paper, and basic sciences reward derivation. This is the single most important change most candidates can make to how they revise.
In physiology, do not memorise the consequence, understand the mechanism and predict the consequence. If you understand the determinants of cardiac output, the response to a change in preload, afterload or contractility follows without being learned. If you understand oxygen transport, the shifts of the dissociation curve are derivable rather than memorable.
In pharmacology, learn the pharmacokinetic principles and the receptor actions, and the drug behaviour follows. Context-sensitive half-time is not a fact to be memorised for each agent; it is a consequence of distribution and clearance that you can reason about. Side effects follow from receptor profiles.
In physics, understand the principle and the equation follows, rather than the other way round. A candidate who understands why flow through a tube depends so heavily on radius does not need to recall the fourth power; it falls out.
The exam tests application, and application is what derivation produces. Memorised facts answer the questions you anticipated. Derivation answers the ones you did not.
Space the things that genuinely must be recalled
Not everything derives, and it is worth being explicit about what does not, so your memorisation is directed.
The equations, and specifically the ones you cannot reconstruct. The physical properties of the individual agents: the boiling points, the saturated vapour pressures, the blood-gas partition coefficients, the minimum alveolar concentrations. The doses. The specific numerical values that recur.
These are pure recall, they interfere with each other, and they decay. They are exactly what spaced repetition is for, and reading them repeatedly is close to useless. Put them into retrieval practice early and keep returning them.
Practise the paper, not just the topics
Two structural points.
Ninety questions in three hours is two minutes each, which is comfortable, so time pressure is not usually what defeats candidates. Sustained accuracy across a dense basic science paper is. Build to full 90-question timed papers, and sit at least two under proper conditions.
And there is no negative marking. One mark per correct answer, nothing deducted for a wrong one. That means a blank is a mark surrendered for nothing, and eliminating one or two options and guessing between the rest is strictly better than leaving an answer empty. Candidates still leave questions blank, and it is the cheapest mistake in the exam.
A note on the 2027 changes
One forward-looking point, because it affects how you plan.
The FRCA examinations are changing from July 2027, subject to approval, and the Primary MCQ becomes the Primary Applied Knowledge Test. For your revision, this matters less than it sounds: it remains a single best answer paper drawn from the same curriculum, so the practice you are doing now carries directly across. The larger change is on the clinical side, where a single Clinical Anaesthetic Sciences Examination replaces both the OSCE and the SOE.
We set out the transition and what it means for your timeline in the new Primary FRCA from 2027.
Where iatroX fits
iatroX's Primary FRCA bank is mapped to the current single best answer format and tracks physiology, pharmacology and physics as separate domains, so the science you have been avoiding cannot hide behind a healthy overall figure. The adaptive engine targets the mechanisms and calculations you are genuinely weak in, spaced repetition returns the equations, agent properties and numerical values that are pure recall and decay fastest, and missed questions can be opened in the Socratic Tutor, which asks you to derive before it explains, which is precisely the habit this paper rewards. Try it with free sample questions at iatroX. For the general method of deriving rather than recalling, see rebuilding basic science through mechanism questions.
Frequently asked questions
What is the format of the Primary FRCA MCQ? A three-hour examination of 90 single best answer questions, with one mark per correct answer and a maximum of 90 marks. Multiple true-false questions were removed in September 2023, and there is no negative marking.
Which domain do Primary FRCA candidates most neglect? Physics and clinical measurement. It feels least like medicine, so it is postponed, and yet it is finite and entirely learnable in a way that physiology is not, which makes it the best return on revision hours.
Should I memorise or derive for the Primary? Derive wherever possible. The paper tests application, and understanding a mechanism lets you answer questions you did not anticipate. Reserve memorisation, and spaced repetition, for what genuinely cannot be derived: equations, agent properties and specific numerical values.
Should I guess if I do not know an answer? Always. There is no negative marking, so a blank guarantees zero while a guess after eliminating one or two options has a reasonable chance of scoring. Leaving questions unanswered is the cheapest mistake available in this exam.