Oct 29, 2026 • Exam Analytics Report•42 Step 1 & Step 2 CK Forms Ranked
Every NBME Form Ranked: Objective AI Difficulty vs. Subjective Student Consensus
We graded every USMLE Step 1 and Step 2 CK practice form on two scales: Objective Difficulty (reading length, multi-step reasoning hops, and curriculum match) versus Subjective Student Consensus (how brutal the form feels on Reddit & SDN).
Quick Cheat Sheet: Modern Forms by Difficulty Tier (Click Any Form to Inspect)
Sorted from hardest score-droppers to fairest baselinesS-Tier • Hardest / Score-Droppers86–93 Subj
Highest 3-step trap rates or harshest curves. Expect 5–8 pt dips; don't panic.
A-Tier • Exam-Day Realistic74–85 Subj
Longer modern stems (78–96w) and multi-system reasoning. Best late-prep predictors.
B-Tier • Fair Baselines61–73 Subj
High core-curriculum match (78–82%) and fair curves. Ideal for early- to mid-prep.
Objective Difficulty vs. Subjective Reported Difficulty (Same Plot)
Click any point on the chart to inspect that form's exact reading length, multi-step reasoning rate, and student consensus below.
View:
Objective Difficulty (AI + Curriculum Model)Subjective Reported Difficulty (Student Consensus)
Selected FormNewest Modern (Forms 32–34)Hardest Modern
NBME 33
Objective Score78.0A-
Student Consensus93.0S
Feel vs. Objective+15.0 pts
Takeaway: Consensus hardest modern NBME on r/step1: 7.5% 3-hop rate, 72.9% core curriculum match rate, and 73.2% AI baseline reasoning score.
1. Reading Length~77 words / stem
2. Multi-Step Reasoning81.6% (2+ steps)
3. 3-Step Trap Rate7.5% of items
4. Core Prep Match72.9% direct match
1. The NBME 33 vs. 34 Paradox
Why Form 34 Has 90-Word Stems Yet Feels Fairer Than Form 33
- • NBME 34 has the longest stems ever (~90 words) and highest 2+ step reasoning rate (86.2%).
- • Yet students rate NBME 33 (93 / S-Tier) much harder than Form 34 (78 / A-).
- • Why: Form 33 packs 7.5% 3-step traps, whereas 92.5% of Form 34's concepts repeat topics already tested on Forms 31–33.
2. The “Short-Stem Trap” Forms
Why NBME 25 & 28 (and Legacy 22) Cause Sudden Score Drops
- • Shorter stems do not mean easier questions: NBME 25 (~67 words) has an 8.5% 3-step chain rate (highest of modern forms).
- • NBME 28 (~69 words) packs more competing clinical clues per stem (4.66) and lower curriculum match (76.3%) than Forms 26 or 29.
- • Tip: Start dedicated with NBME 26 or 29 instead of taking Form 25 cold.
3. Step 2 CK Forms 9–15
Clean Baselines (10 & 11) vs. 50/50 Management Traps (9, 12 & 15)
- • NBME 10 & 11 are the cleanest baselines (119–124 words; 81.4% core curriculum match on Form 11).
- • NBME 9 & 12 feel +14 to +16.5 pts harder than their objective score due to 50/50 next-step dilemmas.
- • NBME 14 & 15 are the best late-stage predictors (Form 15 tests newer QI, ethics, and second-line therapy).
Recommended Practice Exam Order (Week-by-Week)
USMLE Step 1 Order (Forms 25–34 + Free 120)
- 1. Early Baseline: NBME 26 or 29— Highest curriculum match (82.1% & 75.7%) and fair curves.
- 2. Mid-Prep Audit: NBME 27 → 28 → 30 — Exposes 50/50 distractor traps while you still have weeks to remediate weak systems.
- 3. Long-Stem Transition: NBME 31 → 32 — Steps up stem length from ~78 to ~84 words.
- 4. Final 2 Weeks: NBME 33 → 34 → Free 120 (2026)— Review Form 33's 3-step concepts thoroughly, then ride Form 34 and the Free 120 into test day.
USMLE Step 2 CK Order (Forms 9–15 + Free 120)
- 1. Clean Baseline: NBME 10 or 11 — Shortest stems (119–124w) and highest core prep alignment (81.4%).
- 2. Mid-Prep Trap Inoculation: NBME 9 & 12— Great learning tools; don't overreact to their harsher curves.
- 3. Modern Chart Conditioning: NBME 13 → 15 — 133-word chart stems on Form 13 and newer QI/ethics phrasing on Form 15.
- 4. Final Week Predictor: NBME 14 + Step 2 Free 120 — Most balanced score predictor + 144.5-word test-day pacing rehearsal.
Complete Ranked Form Table (33 Forms)
Click any column header to sort, or click any row to highlight that form on the chart.
| Era | Student Takeaway | |||||||
|---|---|---|---|---|---|---|---|---|
| NBME 1 | Legacy Era (Forms 1–7) | 38.8 C | 26.0 D | -12.8 | ~38w | 57% / 2.3% | 72.1% | [Lenient] Early retired baseline; short 1-step recall stems (38 median words) and direct buzzword associations. |
| NBME 2 | Legacy Era (Forms 1–7) | 45.3 C+ | 29.0 D | -16.3 | ~40w | 68.1% / 2.7% | 70.8% | [Lenient] Classic short-vignette recall; more images (16.8%) than Form 1 but straightforward direct lead-ins. |
| NBME 3 | Legacy Era (Forms 1–7) | 45.0 C+ | 30.0 D | -15.0 | ~53.5w | 70.7% / 2.2% | 79.5% | [Standard] Fair early-era form with high core curriculum overlap (79.5% direct concept match) and 53.5-word median stems. |
| NBME 4 | Legacy Era (Forms 1–7) | 50.8 C+ | 34.0 C | -16.8 | ~47w | 69% / 2.4% | 71.9% | [Standard] Slightly denser pathophysiologic distractors (4.60 entities/stem) than Forms 1–3. |
| NBME 5 | Legacy Era (Forms 1–7) | 51.7 C+ | 36.0 C | -15.7 | ~48.5w | 67.3% / 2% | 70.3% | [Standard] More hidden diagnoses (65.7%) than earlier retired forms; tests foundational mechanisms. |
| NBME 6 | Legacy Era (Forms 1–7) | 54.0 B- | 39.0 C | -15.0 | ~54w | 70.8% / 4.4% | 75.9% | [Standard] Introduces more 3-hop mechanism chains (4.4%) and gross/microscopic pathology images (19.0%). |
| NBME 7 | Legacy Era (Forms 1–7) | 63.8 B | 46.0 C+ | -17.8 | ~67w | 76.2% / 2.8% | 69.1% | [Moderate] First major stem-length jump (67.0 median words); marks the transition toward multi-sentence clinical vignettes. |
| NBME 11 | Mid Legacy (Forms 11–19) | 56.5 B- | 44.0 C+ | -12.5 | ~74.5w | 78.6% / 2.4% | 80.6% | [Forgiving] Widely viewed as a confidence-building legacy baseline with high core curriculum alignment (80.6% direct concept match). |
| NBME 12 | Mid Legacy (Forms 11–19) | 59.9 B- | 48.0 B- | -11.9 | ~69w | 82.7% / 3.7% | 75.5% | [Standard] Higher 2+ hop reasoning rate (82.7%) than Form 11, though still classic textbook presentations. |
| NBME 13 | Mid Legacy (Forms 11–19) | 55.1 B- | 55.0 B- | -0.1 | ~74w | 67.7% / 4.8% | 75.4% | [Harsh] Reported as trickier than 11/12 due to a steeper curve and 85.5% indirect mechanism lead-ins. |
| NBME 15 | Mid Legacy (Forms 11–19) | 48.3 C+ | 52.0 B- | +3.7 | ~67w | 71.6% / 2% | 81.3% | [Moderate] Balanced mid-era form; high core curriculum alignment (81.3% direct concept match) keeps perceived difficulty moderate. |
| NBME 16 | Mid Legacy (Forms 11–19) | 56.2 B- | 58.0 B | +1.8 | ~69w | 78.1% / 1.4% | 77.8% | [Harsh] Steeper curve and heavier image/pathology load (21.0% images); punishes rushed reading. |
| NBME 17 | Mid Legacy (Forms 11–19) | 57.0 B- | 56.0 B | -1.0 | ~70w | 78.1% / 4.7% | 82.4% | [Harsh] High core curriculum overlap (82.4%), but unforgiving pre-P/F curve where a few misses dropped 3-digit scores. |
| NBME 18 | Mid Legacy (Forms 11–19) | 66.8 B | 82.0 A | +15.2 | ~71w | 72% / 2% | 60% | [Brutal Curve] Famous pre-Pass/Fail final predictor: steep curve + 60.0% core curriculum match rate made it feel intimidating despite 71-word stems. |
| NBME 19 | Mid Legacy (Forms 11–19) | 67.6 B | 86.0 A+ | +18.4 | ~68w | 76.5% / 4.2% | 66.5% | [Infamous Curve] Notoriously brutal scoring curve on r/step1 where 85%+ correct still produced disappointing 3-digit scores. |
| NBME 20 | Pre-P/F Transition (Forms 20–24) | 62.8 B | 81.0 A | +18.2 | ~64w | 83.3% / 6.1% | 70.3% | [Harsh] First form of the 20–24 rollout; heavy biochemistry/genetics and 85.4% indirect asks shocked test-takers. |
| NBME 21 | Pre-P/F Transition (Forms 20–24) | 67.6 B | 65.0 B+ | -2.6 | ~67w | 82.6% / 5.8% | 68.3% | [Fair] Consensus fairest of the 20–24 cohort; balanced organ-system distribution and predictable curve. |
| NBME 22 | Pre-P/F Transition (Forms 20–24) | 76.1 A- | 84.0 A | +7.9 | ~69w | 82.9% / 8.6% | 56.4% | [Harsh] Infamous "Anatomy Shelf" form: lowest core curriculum match rate in Step 1 history (56.4%) + 8.6% 3-hop chains. |
| NBME 23 | Pre-P/F Transition (Forms 20–24) | 75.1 A- | 85.0 A | +9.9 | ~78w | 80.4% / 3.6% | 67.2% | [Harsh] Voted hardest/most obscure of 20–24; highest distractor entity density (5.25/stem) and lowest knowledge-graph alignment (0.776). |
| NBME 24 | Pre-P/F Transition (Forms 20–24) | 73.1 B+ | 69.0 B+ | -4.1 | ~78w | 90.5% / 3.6% | 72.4% | [Fair] Longer stems (78.0 words) and 90.5% 2+ hop rate, but fair curve and strong predictive value. |
| NBME 25 | Core Modern (Forms 25–31) | 67.9 B | 88.0 S | +20.1 | ~67w | 79.3% / 8.5% | 76.6% | [Brutal] Universally rated the most demoralizing modern baseline: 8.5% 3-hop chains + obscure biochem/anatomy traps cause 5–10% score drops. |
| NBME 26 | Core Modern (Forms 25–31) | 60.8 B | 64.0 B | +3.2 | ~72w | 76.4% / 4.8% | 82.1% | [Fair] Approachable modern form with the highest core curriculum match rate (82.1%) of Forms 25–34. |
| NBME 27 | Core Modern (Forms 25–31) | 63.1 B | 71.0 B+ | +7.9 | ~74.5w | 79.1% / 3.5% | 78.9% | [Moderate] Fair overall, though Block 3 is frequently cited on r/step1 for close 50/50 process-of-elimination choices. |
| NBME 28 | Core Modern (Forms 25–31) | 65.3 B | 84.0 A | +18.7 | ~69w | 76.6% / 5.1% | 76.3% | [Harsh] Considered the second hardest of 25–31 (after 25); vaguer descriptions, 4.66 distractor entities/stem, and quirky infectious/repro items. |
| NBME 29 | Core Modern (Forms 25–31) | 73.1 B+ | 61.0 B | -12.1 | ~68w | 75.4% / 7.6% | 75.7% | [Forgiving] Consensus "confidence booster" of 25–31; shorter stems (68.0 words) and classic high-yield disease scripts (0.852 knowledge-graph alignment). |
| NBME 30 | Core Modern (Forms 25–31) | 67.6 B | 73.0 B+ | +5.4 | ~72w | 79.3% / 3.7% | 75.3% | [Fair] Balanced, clinical vignette-driven form; tougher than 26/29 due to lower core curriculum match rate (75.3%) but very fair. |
| NBME 31 | Core Modern (Forms 25–31) | 72.0 B+ | 76.0 A- | +4.0 | ~77.5w | 81.3% / 4.5% | 74.4% | [Exam-Like] Longer stems (77.5 words) and 4.92 entities/stem; previously the gold-standard final predictor before Forms 32–34. |
| NBME 32 | Newest Modern (Forms 32–34) | 73.8 B+ | 83.0 A | +9.2 | ~83.5w | 82.2% / 5.7% | 74.6% | [Tough Modern] First of the 2024–2026 shift: median stem length jumps to 83.5 words with ethics/communication and multi-organ integration. |
| NBME 33 | Newest Modern (Forms 32–34) | 78.0 A- | 93.0 S | +15.0 | ~77w | 81.6% / 7.5% | 72.9% | [Hardest Modern] Consensus hardest modern NBME on r/step1: 7.5% 3-hop rate, 72.9% core curriculum match rate, and 73.2% AI baseline reasoning score. |
| NBME 34 | Newest Modern (Forms 32–34) | 80.5 A | 78.0 A- | -2.5 | ~90w | 86.2% / 6% | 72.3% | [Fair Rebound] Longest NBME stems ever (90.0 words, 86.2% 2+ hop), yet 92.5% concept overlap with prior forms makes it feel significantly fairer than Form 33. |
| Free 120 (2021) | Free 120 (Modern) | 79.7 A- | 68.0 B+ | -11.7 | ~99w | 80% / 1.7% | 62.3% | [Exam-Style] Long UWorld-style vignettes (99.0 words) and 62.3% core curriculum match rate, but approachable answer choices. |
| Free 120 (2024) | Free 120 (Modern) | 79.3 A- | 75.0 A- | -4.3 | ~108w | 89.5% / 0% | 62.3% | [Exam-Style] Longest vignettes in the corpus (108.0 words) and 33.3% multimedia/images; tests stamina and chart filtering. |
| Free 120 (2026) | Free 120 (Modern) | 86.8 S | 77.0 A- | -9.8 | ~96w | 79% / 4% | 62.3% | [Exam-Style] Closest match to current test-day pacing: 96.0-word stems, 33.0% images, and conversational answer choices. |
How We Graded the Forms (Without Storing Any Proprietary Exam Content)
1. Objective Difficulty (0–100): Pacing, Hops & Curriculum Graph
Computed across our three-node AI reasoning cluster and open medical curriculum knowledge graph using de-identified student study-session pacing logs and concept-level topic mappings:
- Multi-Step Reasoning (28 pts): Share of tested concepts requiring 2-step or 3-step clinical deduction vs. 1-step recall.
- Reading & Pacing Load (24 pts): Estimated from student time-per-item telemetry and word-length distributions (~38w on early forms to ~90–144w on modern forms).
- Core Curriculum Match (20 pts): Retrieval-augmented concept matching against our open medical curriculum graph and the public USMLE® Content Outline.
- Unstated Diagnosis & Clue Filtering (28 pts): Frequency of indirect mechanism/management lead-ins and competing differential findings per stem.
2. Subjective Consensus (0–100) & Copyright Independence
Aggregated from public student score-progression spreadsheets, post-exam polls, and discussion threads on r/step1, r/Step2, and Student Doctor Network (SDN), weighting reported score-drop frequency and perceived curve harshness.
Independent Research & Non-Reproduction Notice: All figures in this study are statistical aggregates derived from de-identified student study telemetry, public community score reports, and IvyMed's own curriculum knowledge graph. No proprietary or copyrighted NBME® or USMLE® question stems, answer choices, or commercial third-party textbook passages are stored, reproduced, or distributed.
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