Question 1

Why does NBME 25 feel so much harder than other Step 1 forms?

Accepted Answer

NBME 25 is the most basic-science-heavy active Step 1 form. Questions use short stems testing isolated facts — obscure biochemistry pathways, cell biology minutiae, and embryological mechanisms that appear far less frequently on the real Step 1 exam. Wrong answers here almost always point to a basic science recall gap, not a clinical reasoning deficit. This content mismatch is why NBME 25 scores feel disproportionately low compared to UWorld performance.

NBME 25 is typically taken in Week 1–2 of dedicated study, before the clinical reasoning built through a full UWorld pass has developed. The combination of early timing and basic-science content weighting produces a score that systematically underestimates your real exam potential. Use it to identify which basic science subjects need targeted review — not to judge your overall readiness.

Question 2

Does NBME 25 overpredict or underpredict actual Step 1 scores?

Accepted Answer

Community reports consistently indicate that NBME 25 underpredicts actual Step 1 scores — students typically score 5–10 points higher on the real exam than their NBME 25 predicted score suggests. This is the opposite of UWSA 1 (+10.5 pts overprediction) and UWSA 2 (+6.9 pts overprediction, Seal et al. 2020, Cureus, PMC7198101). No peer-reviewed study has published R² or bias data specific to NBME 25 — it post-dates the most comprehensive academic dataset available (Seal et al. 2020, which covers forms 13–24 only). The underprediction pattern reflects both the form's basic-science content bias and the fact that it is typically taken early in dedicated study, before preparation has reached its peak.

Question 3

I scored much lower on NBME 25 than I expected — should I panic?

Accepted Answer

No. A lower-than-expected NBME 25 score is one of the most commonly reported experiences on r/step1 and SDN. NBME 25 is specifically calibrated around the obscure basic science content that most students haven't reviewed deeply at the start of dedicated study. Treat the score as a diagnostic map, not a verdict. Identify which subjects drove your wrong answers — glycogen storage diseases, vitamin deficiencies, cell cycle defects, embryological anomalies — and add targeted review sessions for those topics. Students who panic at NBME 25 and abandon their study plan make a common and costly mistake.

Question 4

When is the best time to take NBME 25?

Accepted Answer

NBME 25 is best taken in Weeks 1–2 of your dedicated period, as your first formal self-assessment. Taking it before significant UWorld or content review work is intentional: the form is designed for early-period gap identification, not late-stage readiness assessment. Optimal sequence: NBME 25 (Week 1–2, baseline) → address identified basic science gaps → NBME 26 (Week 3–4, post-UWorld checkpoint) → NBME 27 (Week 4–5, Bugs & Drugs diagnostic). Do not use NBME 25 as a scheduling signal — its accuracy drops sharply when taken more than 4 weeks before exam day.

Question 5

What should I focus on after a low NBME 25 score?

Accepted Answer

Analyze your wrong answers by subject category and prioritize the areas with the highest wrong-answer concentration. Common high-yield targets after a low NBME 25: (1) Biochemistry — review metabolic pathway defects using the Biochemistry section of First Aid + Boards & Beyond Biochemistry module; (2) Cell Biology — cell cycle checkpoints, apoptosis pathways, receptor classes; (3) Embryology — B&B Embryology for high-yield developmental defects. The Anking Biochemistry/Cell Bio deck is an efficient spaced-repetition complement. Avoid retaking NBME 25 to verify improvement — once seen, scores are invalidated by recall.

Question 6

Why do scores usually jump 10–15 points from NBME 25 to NBME 26?

Accepted Answer

The jump is driven by a content distribution shift, not a sudden improvement in real knowledge. NBME 25 rewards isolated basic science recall — biochemistry, cell biology, embryology — subjects where students have the most concentrated gaps early in dedicated study. NBME 26 rewards clinical reasoning and pathophysiology integration, which aligns directly with UWorld preparation. Students who have done substantial UWorld work between the two forms score markedly better on NBME 26 simply because the content now matches their training. The jump is real, but it should not be read as proof of readiness — NBME 26 still slightly overpredicts real scores.

Wrong Answers	Predicted Score	Readiness Signal
20	~255	Exceptional
30	~244	Strong
40	~233	Above average
50	~221	Solid
60	~210	Near passing — targeted basic science review
72	~197	Right above passing threshold
73+	≤196	Below passing — do not schedule

	NBME 25	NBME 26	NBME 27	NBME 28
Slope (pts/wrong)	1.113	1.152	1.110	1.048
Difficulty	Easy	Moderate	Moderate	Easy
Recommended timing	Week 1–2	Week 3–4	Week 4–5	Week 5–6
Score bias	Underpredicts ~5–10	Slight overpredict	Slight overpredict +2–4	Overpredicts +3–5
Primary use	Basic science baseline	Clinical reasoning check	Bugs & Drugs diagnostic	Confidence builder

Wrong	Correct	% Correct	Predicted Score	Pass Prob
0	200	100%	277	99.9%
5	195	97.5%	271	99.9%
10	190	95%	266	99.9%
15	185	92.5%	260	99.9%
20	180	90%	255	99.9%
25	175	87.5%	249	99.9%
30	170	85%	244	99.9%
35	165	82.5%	238	99.9%
40	160	80%	233	99.9%
45	155	77.5%	227	99.6%
50	150	75%	221	98.9%
55	145	72.5%	216	97.3%
60	140	70%	210	92.6%
65	135	67.5%	205	83.5%
70	130	65%	199	63.2%
75	125	62.5%	194	41.1%
80	120	60%	188	19.2%
85	115	57.5%	182	7.4%
90	110	55%	177	3.2%
95	105	52.5%	171	1.1%
100	100	50%	166	0.4%
105	95	47.5%	160	0.2%
110	90	45%	155	0.1%
115	85	42.5%	149	0.1%
120	80	40%	143	0.1%
125	75	37.5%	140	0.1%
130	70	35%	140	0.1%
135	65	32.5%	140	0.1%
140	60	30%	140	0.1%
145	55	27.5%	140	0.1%
150	50	25%	140	0.1%
155	45	22.5%	140	0.1%
160	40	20%	140	0.1%
165	35	17.5%	140	0.1%
170	30	15%	140	0.1%
175	25	12.5%	140	0.1%
180	20	10%	140	0.1%
185	15	7.5%	140	0.1%
190	10	5%	140	0.1%
195	5	2.5%	140	0.1%
200	0	0%	140	0.1%

NBME 25 Score CalculatorYour Week 1–2 Dedicated Baseline — The Basic Science Gap Finder

Why NBME 25 Scores Feel Deflating — And Why That's Expected

What NBME 25 Tests More — and Less — Than Other Forms

NBME 25 Score Benchmarks — What Your Wrong-Answer Count Means

NBME 25 / 26 / 27 / 28 — Difficulty & Timing Comparison

NBME 25 Score Conversion Table — Step 1

About NBME 25

Other Step 1 Practice Exams

NBME 25 Step 1 Calculator — FAQ