Question 1

How accurate is UWSA 2 for predicting Step 2 CK?

Accepted Answer

UWSA 2 is the single strongest predictor of actual Step 2 CK performance among all available practice resources. Community data consistently places its prediction within ±5–7 points when taken under real exam conditions in the final 7–14 days before the exam. Note: unlike UWSA 2 for Step 1 — which has a published R²=0.680 (Seal et al. 2020, Cureus, PMC7198101) — no equivalent peer-reviewed study has been published for Step 2 CK. The ±5–7 pt figure reflects community consensus, not a formal academic study.

Question 2

Why does UWSA 2 overpredict Step 2 CK scores?

Accepted Answer

The primary driver is a scoring curve difference: UWSA 2's curve is more generous than the actual Step 2 CK exam's curve, so the same number of correct answers maps to a slightly higher predicted score. A secondary factor is question difficulty — UWSA questions closely mimic USMLE style but are generally slightly easier. Importantly, UWSA uses a completely separate question bank from UWorld QBank, so direct question familiarity is not a cause of overprediction.

Question 3

By how much does UWSA 2 overpredict, and how should I adjust?

Accepted Answer

Community data places average overprediction at approximately 5 points (range 0–8 pts for most students; outliers up to 15 pts have been reported). A practical rule of thumb: subtract 5 points from your UWSA 2 predicted score for a conservative scheduling estimate. As a reference: the current Step 2 CK passing threshold is 218 (effective July 1, 2025, per USMLE.org). If your adjusted score — UWSA 2 predicted minus 5 pts — exceeds 223, you are likely ready to schedule.

Question 4

When should I take UWSA 2 for Step 2 CK?

Accepted Answer

UWSA 2 is best taken in the final 7–10 days before your exam date. Take all 4 blocks in a single sitting without breaks to simulate real test-day stamina. Because it is the strongest single predictor of your actual score at this stage, it serves as the primary scheduling signal — but remember to subtract ~5 pts before making your final scheduling decision.

Question 5

What's the difference between UWSA 1 and UWSA 2 for Step 2 CK?

Accepted Answer

UWSA 2 is substantially more accurate for Step 2 CK than UWSA 1. UWSA 1 overpredicts by approximately 10–15 points on average, making it unreliable for scheduling decisions — use it in Weeks 3–4 of dedicated study purely to identify knowledge gaps. UWSA 2 overpredicts by only ~5 points, making it the appropriate final scheduling signal in the last 7–10 days before your exam. The recommended sequence is: UWSA 1 (gap identification) → NBME 13 or 14 (readiness check) → UWSA 2 (scheduling decision).

Question 6

Does the May 2026 Step 2 CK format change affect UWSA 2 as a predictor?

Accepted Answer

As of May 7, 2026, Step 2 CK changed from 8 × 60-minute blocks (40 questions each) to 16 × 30-minute blocks (18–20 questions each), maintaining the same 9-hour total. UWSA 2 still uses the older 4 × 40-question format (160 questions total). This format mismatch does not affect UWSA 2's score prediction accuracy — the predictive formula is score-based, not format-based. However, for block-pacing and stamina practice, supplement UWSA 2 with the official USMLE test delivery software tutorials, which reflect the current 30-minute block structure.

	UWSA 1	UWSA 2
Avg. overprediction	~10–15 pts	~5 pts
Recommended timing	Week 3–4 of dedicated	Final 7–10 days
Primary use	Gap identification	Scheduling decision
Format	160q · 4 blocks	160q · 4 blocks
Data source	Community consensus	Community consensus

Wrong	Correct	% Correct	Predicted Score	Pass Prob
0	160	100%	280	99.9%
5	155	96.9%	275	99.9%
10	150	93.8%	269	99.9%
15	145	90.6%	264	99.9%
20	140	87.5%	258	99.9%
25	135	84.4%	253	99.8%
30	130	81.3%	248	99.6%
35	125	78.1%	242	98.7%
40	120	75%	237	96.8%
45	115	71.9%	231	91.2%
50	110	68.8%	226	80.8%
55	105	65.6%	221	63.2%
60	100	62.5%	215	36.8%
65	95	59.4%	210	19.2%
70	90	56.3%	204	7.4%
75	85	53.1%	199	3.2%
80	80	50%	194	1.3%
85	75	46.9%	188	0.4%
90	70	43.8%	183	0.2%
95	65	40.6%	177	0.1%
100	60	37.5%	172	0.1%
105	55	34.4%	167	0.1%
110	50	31.3%	161	0.1%
115	45	28.1%	156	0.1%
120	40	25%	150	0.1%
125	35	21.9%	145	0.1%
130	30	18.8%	140	0.1%
135	25	15.6%	140	0.1%
140	20	12.5%	140	0.1%
145	15	9.4%	140	0.1%
150	10	6.3%	140	0.1%
155	5	3.1%	140	0.1%
160	0	0%	140	0.1%

UWSA 2 Score CalculatorStep 2 CK Predictor & Score Conversion

UWSA 1 vs UWSA 2 — Step 2 CK Accuracy Comparison

UWSA 2 Score Conversion Table — Step 2 CK

About UWSA 2

Other Step 2 CK Practice Exams

UWSA 2 Step 2 CK Calculator — FAQ