Step 2 CK Subject Weighting Explained
How NBME weights each clinical rotation on Step 2 CK, what the content area bars on your NBME report actually represent, and where to spend your final two weeks.
Step 2 CK isn't 50% Internal Medicine. It's not 25% Surgery. The content distribution is more nuanced — and weighted differently than most students assume. Here's how NBME actually allocates questions across rotations.
Approximate content distribution
- Internal Medicine: 30-35%
- Surgery: 12-15%
- Pediatrics: 12-14%
- Obstetrics & Gynecology: 8-10%
- Psychiatry: 8-10%
- Family Medicine: 6-8% (significant overlap with IM)
- Emergency Medicine: 4-6%
- Neurology: 3-4%
- Ethics, Biostats, Patient Safety: 5-8% combined
Source: estimated from USMLE content outlines and student item recall across multiple Step 2 CK forms (2024-2026). Ranges simplified to midpoints for visualization.
These percentages drift slightly between forms. Don't optimize to the decimal — but DO recognize that IM is the single largest swing factor.
What the NBME content bars actually compare you to
The content area bars on your NBME report compare you to a reference cohort that NBME selects internally. That cohort is not a representative sample of your competition. Surgery and IM cohorts skew toward higher absolute performance; Psychiatry skews lower. A solid black bar in Surgery is more concerning than the same bar in Psychiatry.
Where final-two-week effort produces the biggest score gain
Per-question effort yields the biggest score lift in Internal Medicine, simply because IM accounts for the largest share of items. A 5-percentage-point improvement in IM accuracy gains more points than the same improvement in Neurology. Prioritize IM weaknesses first, then high-yield Surgery and Pediatrics topics.
How to read your weakness map
- Find the 2-3 solid black bars on your most recent NBME
- Weight by content share: IM bars matter most, Neuro bars matter least
- Cross-reference with your UWorld percent correct by system
- Spend final dedicated time on the intersection of NBME weak + UWorld weak
Our paid report includes a personalized weakness map combining your self-reported weak subjects with cohort-level reference data — far more actionable than NBME's reference cohort alone.
Ready to predict your Step score?
Free, no signup. Multi-source aggregation, 95% confidence interval, and a personalized study plan.
Run the calculatorRelated articles
Most Tested Topics on Step 2 CK (2026)
The high-yield topics that appear repeatedly on Step 2 CK forms: diabetic ketoacidosis, pre-eclampsia, anti-arrhythmic toxicities, and the rest of the must-know list.
Step 3 CCS Cases: Complete Walkthrough
How the Step 3 Computer-based Case Simulations (CCS) work, the scoring rubric, the time-management strategy, and the 10 case archetypes you'll encounter.
IMG Step 2 CK Strategy: From 220 to 250
A focused plan for international medical graduates targeting a competitive Step 2 CK score. Where to spend study time, how to use AMBOSS effectively, and the 12-week roadmap.