For MRCP Part 1 basic-science gaps, combine official sample questions, an explanatory reference and targeted question practice. Choose the next resource according to the error: forgetting a fact needs a different response from misunderstanding a mechanism. Pastest, PassMedicine and iatroX are worth considering, but compare how well their explanations resolve your uncertainty rather than counting questions alone.
This resource guide is published by iatroX and includes its MRCP Part 1 bank alongside other providers. The comparison focuses on resolving a basic-science misconception rather than declaring a universal winner. Product descriptions and resource availability throughout are dated 6 September 2026.
A correct answer can conceal a weak understanding. You may recognise a familiar phrase, eliminate implausible options or remember the position of an answer you have seen before. The useful test is whether you can explain why the relevant mechanism fits the information in the stem.
Calibrate with the Federation's samples
The Federation's MRCP Part 1 sample questions provide an official starting point for the style of assessment. Use them to frame the task before deciding whether you need a broad revision course, a focused explanation or more practice.
Do not use a small sample as a reliable prediction of your eventual examination result. Its value here is calibration: understanding how knowledge is presented and what kind of distinction an answer may require.
When a sample exposes a difficult topic, write a specific question about your understanding. "I need to revise pharmacology" is too broad to determine which resource to open next.
Diagnose the learning problem behind the wrong answer
| What happened | Likely revision need | A useful next activity |
|---|---|---|
| You did not recognise a term | Foundational explanation | Read a concise definition in context |
| You recognised the term but predicted the wrong effect | Mechanistic understanding | Draw or explain the causal sequence |
| You confused two similar mechanisms | Discrimination | Compare the decisive difference |
| You understood the topic but overlooked a condition in the stem | Application | Reattempt a changed example carefully |
| You guessed correctly | Verification of understanding | Explain the answer without looking at the options |
These categories are a suggested review method, not a validated diagnostic instrument. They are useful because each produces a different next action.
A mechanism exercise without memorising another paragraph
Select a fictional practice question from your own learning notes. Before looking at the explanation, write the sequence connecting the starting change to the expected outcome. Keep the steps short enough that another learner can identify where the reasoning breaks.
For a physiology problem, that might mean naming the variable that changes, the relationship you are using and the predicted direction of the effect. For pharmacology, it may mean distinguishing the target, the action at that target and the consequence described in the question.
Then compare your sequence with an appropriate teaching source. Correct the specific missing or mistaken connection. Do not replace the entire note with a copied model explanation that you cannot reproduce in your own words.
Finally, change one condition in the fictional example. If you cannot predict whether the answer changes, the mechanism probably needs further work.
Compare established banks through sample explanations
As published on 6 September 2026, Pastest and PassMedicine both offer MRCP preparation products. They deserve consideration rather than dismissal because a newer platform has additional AI features. An established bank may already suit your preferred explanation style and revision routine.
Try a topic you genuinely find difficult. Assess whether the explanation answers your question, distinguishes the nearest alternative and gives enough context to reconstruct the reasoning. A lengthy explanation is not necessarily a clear one, and a concise explanation is not necessarily incomplete.
A physiology or pharmacology reference remains useful when the gap is foundational. Choose the section that answers the identified question, rather than turning one mistake into an unplanned attempt to reread an entire textbook.
Where the free iatroX Part 1 bank fits
The iatroX MRCP Part 1 question bank is currently available free. That makes it a practical option for starting revision or adding targeted practice without committing immediately to another paid bank.
Use a focused session to test the specific topic you reviewed. Include both unfamiliar questions and a later revisit to the concept; repeatedly answering an identical stem immediately after reading its explanation mainly shows that you remember that explanation.
The paid Socratic Tutor adds guided discussion of the attempted question and the reasoning behind it. Its role is to help identify the misconception, not to turn every short revision session into an extended conversation. Use it most deliberately for errors that recur or explanations that you cannot yet reconstruct.
Build a smaller, more useful revision record
Instead of saving every explanation, record the concept, your previous error and a question that will test the corrected understanding later. A note such as "explain why changing this variable alters that outcome" is more useful than a page of disconnected facts you never revisit.
Use the study planner to reserve time for these weak areas while preserving broad coverage. Do not let a favourite subject dominate simply because answering its questions feels rewarding. Equally, one difficult topic should not consume the whole plan without regard to the rest of the syllabus.
Review the record periodically and remove items you can consistently explain in a new context. The aim is a changing account of what needs work, not a permanent catalogue of every mistake.
When paying adds something meaningful
iatroX's UK pricing, published on 6 September 2026, is £29 a month or £99 a year paid upfront. The annual option works out at £8.25 a month billed annually. That price covers paid question banks, Socratic Tutor, study planning, iatroX Simulations and CPD tools together, rather than charging separate add-ons for simulations or CPD.
The September 2026 free offering is separate from the subscription: Ask-iatroX and free question access have no trial expiry or verification gate. Free samples and designated free banks should not be confused with unlimited access to every paid bank or ongoing tutoring.
Which resource fits your preparation?
Choose an explanatory reference for an unfamiliar mechanism, Pastest or PassMedicine when their sample teaching fits the gap, and the free iatroX Part 1 bank for an accessible starting point. Consider paid tutoring when guided questioning adds something beyond an explanation you can already use independently.
Frequently asked questions
How do I distinguish a memory gap from a mechanism gap?
Try explaining the relationship without looking at the answer options. Being unable to recall one detail is different from being unable to explain why changing it would change the result.
Does getting a Part 1 question right mean I understand it?
Not necessarily. Explain why the closest alternative is wrong and test the same principle in an unfamiliar example.
Do I need a subscription for the iatroX MRCP Part 1 bank?
The catalogue reviewed on 6 September 2026 lists the Part 1 bank as free. Ongoing Socratic Tutor access and the broader paid learning functions are optional subscription features.