The US medical exam preparation market has been dominated by UWorld for a decade. Its question quality is strong. Its bank is large. But its learning model is unchanged: static question bank, manual topic selection, no adaptive engine, no AI study planner, no readiness score. You choose the topics. You decide the pace. You guess whether you are ready.
iatroX offers a different approach — AI-adaptive learning that decides the topics for you based on your performance, schedules your daily study sessions, integrates mock exams at optimal intervals, and provides a readiness score that answers "am I ready to sit?"
Step 2 CK mock exams and AI study plans are now live.
The Step 2 CK Mock Format
iatroX Step 2 CK mocks use 318 questions across timed blocks matching the NBME structure. Real time limits per block. No pausing between blocks. Deferred explanations — no feedback until the entire mock is complete. Auto-submit on timeout.
The post-mock review provides score breakdowns by USMLE content category (internal medicine, surgery, paediatrics, obstetrics and gynaecology, psychiatry, preventive medicine), time-per-question analysis, and detailed explanations referencing current US clinical guidelines.
A half-length option is available for candidates who want timed practice without committing to a full-length simulation.
How iatroX Differs from Traditional US Q-Banks
Adaptive daily practice. Traditional US Q-banks (UWorld, AMBOSS) serve questions from the topics you select. If you choose "cardiology," you get cardiology questions — regardless of whether cardiology is your strongest or weakest area. iatroX's adaptive engine analyses your performance across all Step 2 CK content areas after every question and automatically serves the next question from your weakest domain. You do not select topics. The engine identifies your gaps and addresses them in real time.
AI study planner. The study planner generates a daily revision schedule calibrated to your Step 2 CK exam date and available study time. It progresses through foundation (broad coverage), application (targeted weak-area revision), and performance (mock exams at increasing frequency) phases automatically. No spreadsheet. No guessing. No abandoned colour-coded revision timetable.
Readiness score. The composite metric that tells you whether you are on track for your target score — computed from curriculum coverage, weighted accuracy, and mock exam trends. UWorld provides a predicted score from practice performance; iatroX's readiness score additionally factors in curriculum coverage gaps and mock exam trajectory.
One subscription, all US exams. An iatroX subscription covers Step 2 CK, Step 3, ABFM, ABIM, and ABEM — all within a single account, a single price, and a single performance profile. No separate purchases for each exam. No re-subscribing when you move from Step 2 to Step 3 or from Step 3 to board certification.
The UWorld Question
Every Step 2 CK candidate asks: "Should I use UWorld or iatroX?" The honest answer: the question is wrong. UWorld and iatroX serve different functions, and most high-performing candidates benefit from using both.
UWorld provides the largest Step 2 CK question bank with high-quality, NBME-style questions and detailed explanations. Its question quality is the market benchmark — and has been for years. If you are doing only one Q-bank, UWorld is the established choice.
What UWorld does not provide is adaptive targeting (you manually select topics), a study planner (you manage your own schedule), a readiness score (you estimate your own preparedness from practice percentages), or mock exams with exam-day simulation (UWorld self-assessments exist but function differently from iatroX's timed, deferred-feedback mock format).
iatroX provides the adaptive layer and scheduling intelligence that UWorld lacks. The adaptive engine identifies your weakest USMLE content areas from your performance data and concentrates daily practice there — automatically, on every question, without requiring you to manually select "weak topics." The study planner generates a daily schedule that progresses through foundation, application, and performance phases. The readiness score tells you whether your trajectory is on course for your target score.
The combination approach: UWorld for question volume and quality (the content layer). iatroX for adaptive targeting, scheduling, and readiness tracking (the intelligence layer). This is not a compromise — it is a preparation architecture that leverages the strengths of both platforms.
Step 2 CK Score Targeting
Step 2 CK is now pass/fail for USMLE purposes, but most residency programmes still receive (and consider) the three-digit score. The readiness score on iatroX tracks your trajectory toward exam readiness — and mock exam scores provide data points for estimating your likely three-digit outcome.
The study planner's readiness tiers map to approximate score ranges based on your mock performance and accuracy trends. A candidate consistently scoring 70%+ on iatroX mocks with comprehensive curriculum coverage and an improving trajectory is likely performing at a level associated with a competitive Step 2 CK score. The readiness score provides the confidence to book your exam date — or the data-driven reason to defer if your trajectory is not where it needs to be.
For IMGs
International medical graduates preparing for Step 2 CK face specific challenges: managing preparation alongside clinical rotations (or the J-1/H-1B visa process), building US clinical knowledge from a non-US training foundation, and optimising limited preparation time. The study planner supports daily study time as low as 30 minutes — calibrating the daily task volume to whatever time you have, rather than assuming everyone has 4 hours per day.
For IMGs who have already used iatroX for UKMLA or PLAB preparation and are now targeting US exams, the platform transition is seamless — same account, same interface, same adaptive engine. Your familiarity with the platform means zero learning curve, and any clinical knowledge overlap between UK and US content carries forward in your performance profile.
Step 2 CK Mock Strategy
The Step 2 CK is a long exam — 318 questions across multiple timed blocks. The fatigue factor is significant. Candidates who have never sat through a full-length simulation are at a structural disadvantage on exam day, regardless of their clinical knowledge.
The recommended mock schedule mirrors the approach for other exams: first mock 8 weeks before the exam (baseline), then fortnightly, increasing to weekly in the final month. Each mock provides data: overall score, score by USMLE content category, time-per-question analysis, and flagged questions. The study planner uses this data to recalibrate your daily tasks — concentrating adaptive practice on the content categories where your mock performance was weakest.
The half-length mock option is particularly valuable for Step 2 CK candidates who are also doing clinical rotations. A full-length mock requires an entire free day. A half-length mock can be completed in an evening — still providing timed-pressure experience and performance data, without the full-day time commitment.
Beyond Step 2: The Career-Long Platform
An iatroX subscription does not expire when you pass Step 2 CK. The same account covers Step 3 preparation (the next exam in the USMLE sequence), ABFM certification (for family medicine residents), ABIM certification (for internal medicine residents), and ABEM certification (for emergency medicine residents). Your performance data, your weak-area tracking, and your study planner history carry forward — no cold start, no new subscription, no learning a new platform.
For IMGs pursuing a career in US medicine, iatroX provides a single platform spanning the entire journey from PLAB/UKMLA (UK registration) through USMLE (US licensing) through board certification (specialty practice) — the only platform covering this full trajectory.
Start your Step 2 CK study plan at iatrox.com/study-plan.