AMC MCQ results are reported on a scale from 0 to 500, with a passing score represented as 250. It is tempting, and wrong, to read that as roughly half marks. It is not a percentage conversion of correct answers. It is a scaled ability estimate, generated through computer-adaptive testing, and understanding the difference changes how a candidate should actually judge their own readiness.
How the adaptive exam actually estimates ability
Rather than presenting every candidate with the same fixed 150-question paper, the AMC CAT MCQ exam selects each subsequent question based on how the candidate has performed so far. Answer well, and the system tends to present harder questions; struggle, and it adjusts accordingly. The final scaled score reflects the difficulty of the questions a candidate was able to answer correctly, not simply a raw count of correct responses out of 150.
Why two candidates with the same raw score can get different results
Consider two candidates who each answer roughly the same number of questions correctly across their sitting. If one candidate was, through their own performance, routed towards more difficult questions and still answered a meaningful share correctly, their scaled score is likely to be higher than a candidate who answered a similar raw number correct but was largely presented with easier material. This is exactly why "I got X correct out of 150" is a far less informative statement for this exam than it would be for a fixed-form paper.
Why commercial bank percentages deserve real caution
A confident claim like "70% in our question bank means you are ready" is only as good as the resemblance between that bank's questions and the AMC's actual difficulty distribution, and most commercial banks make no serious attempt to replicate adaptive difficulty weighting at all. A static bank scored purely on raw percentage correct cannot tell a candidate whether they are ready for a scaled, ability-estimated pass mark of 250. Treating a comfortable bank percentage as equivalent to exam readiness is one of the more common and avoidable misjudgements candidates make in the final weeks before sitting.
A broader readiness dashboard worth tracking instead
Rather than anchoring on one number, a more informative readiness picture tracks several signals together: recent accuracy specifically on unseen questions, rather than questions seen before; performance broken down by patient group and clinical domain rather than a single blended figure; accuracy specifically on the harder end of the difficulty range, since that is where the scaled score is most sensitive; the rate of high-confidence incorrect answers, which tend to reflect embedded misconceptions rather than simple gaps; and endurance across a genuinely full-length session, since fatigue late in a 150-question, three-and-a-half-hour sitting can erode a candidate's true ability estimate.
What iatroX analytics can, and cannot, tell you
iatroX's performance analytics can identify genuine trends across these dimensions, unseen-question accuracy, patient-group breakdowns, difficulty-tier performance and confidence patterns, and use that picture to guide where further practice will help most. What it cannot do, and does not claim to do, is generate an official AMC scaled score. Only the AMC's own adaptive engine, sitting the actual exam, can produce that figure. Analytics of this kind are a preparation tool, not a substitute for the exam itself.
Frequently asked questions
What is the difference between a raw score and a scaled score? A raw score is simply the number of questions answered correctly. A scaled score, the figure AMC reports on the 0 to 500 scale, accounts for the difficulty of the specific questions a candidate encountered.
Is 250 a fixed pass mark for everyone? Yes, 250 is the reported pass mark on the AMC's 0 to 500 scale, though the underlying ability required to reach it can be periodically reviewed, as happened from 2026.
Can adaptive scoring be replicated by a static question bank? Not accurately. A static bank can support learning and identify weaknesses, but it cannot replicate the adaptive difficulty selection that produces an official AMC scaled score.