When should you take Step 2 CK?

Main findings

• Students within about 2 points of their goal reached it more than 80% of the time. At 8 to 10 points below the goal, the observed probability was near 50%.
• Observed improvement averaged about +2 points per week far out and +5 per week in the final two weeks.
• Students below 245 with roughly another month remaining showed larger gains; higher-scoring students showed little additional gain.
• Students whose first score looked like a baseline diagnostic below 215 finished at a median of 250.

Early scores that looked like a baseline diagnostic

A diagnostic taken before dedicated can estimate baseline performance, but posts did not consistently label their first assessment as diagnostic. This analysis identified 784 reports whose first assessment looked like one: a low early score, well below everything that followed, taken a median of 61 days out. Lower starting scores were followed by larger gains.

Each line is one diagnostic band; left is the median diagnostic, right is the median real score, with the typical climb.

• Lower diagnostic scores were followed by larger average gains.
• The tenth percentile among students with a diagnostic below 215 finished at 238. Among students starting at 215 or above, very few finished below 230.
• Among students with the same diagnostic score, those with an additional month of dedicated finished about +0.3 points higher on average.

Use a low diagnostic to set the initial study plan and an achievable interim goal. Later practice scores provide a better basis for the final exam date.

Goal probabilities from recent assessments

For 1,784 students who took a practice test within two weeks of their exam, here is how a score, after accounting for differences between forms, translated into the odds of clearing each goal and the median real score that followed. Darker cells are higher odds:

Scores were corrected for which form was taken because the forms differ in harshness by about 11 points. These are observed outcomes under the schedules students chose and may not apply to an individual. The predictor makes the same correction and estimates a personalized probability and range.

Additional time and score improvement

Among students who were already at the same score level, this chart compares final scores by how much time remained. These are observed comparisons and do not show how many points one person would gain by changing dates.

Average score difference seen with waiting longer, grouped by current score level.

• Below 245: students with a month of extra study finished about +8 additional points for students below 230, and +4 extra in the 230–244 range.
• 245–259: a month added roughly +3 extra points, with little additional difference between one and two months.
• 260 and up: the observed additional gain from waiting was close to zero.
• Additional time was most useful when scores were below the goal and still increasing. Its estimated value decreased as current scores rose.

Improvement by time remaining

• Across consecutive practice tests, students gained about +2 points per week when five or more weeks out, increasing to +5 per week inside the final ten days. Observed weekly gains were highest near the exam.
• A single final-week drop added little once the student's other scores were considered. See the score-swing analysis.
• The typical student took the final practice test about 5 days before Step 2. The subsequent gain was similar whether that gap was two days or two weeks.

Using these results to choose a date

• Start with the most recent score after accounting for form differences and the goal probabilities in the table above.
• Students within about two points of a goal and on a steady trajectory gained little from waiting.
• Students eight or more points below a goal and still improving had more potential benefit from focused additional weeks. Re-test before committing to a new date.
• Use the overall average and trajectory when one form is unexpectedly low.
• A flat trajectory should prompt a review of study method before the dedicated period is extended.
• The time between the final practice test and exam day showed no clear relationship with the final score, so scheduling can accommodate personal constraints.

For an estimate based on your own scores, the predictor uses every practice test you have taken and the timing of each.

Common questions

How do I know if I'm ready to take Step 2 CK?

Look at your most recent NBME or UWSA after accounting for differences between forms. Students within about 2 points of a goal cleared it 80%+ of the time; about 8-10 points below, the odds were near half. A practice score in the 240–247 range, for example, gave a 63% chance of 250 and a median real score of 252. The predictor estimates a personalized probability and prediction range.

How much will my score improve before the exam?

It depends on the current score and time remaining. From about a month out, students below 230 gained a median of 28 more points, compared with about 11 among students in the 245–259 range. Observed weekly gains ranged from about +2 points far out to +5 in the final fortnight.

Should I push my exam date back to study more?

Students who were below their goal and still improving showed the largest gains with additional study time. In the 230–244 range, those with roughly another month remaining finished about +4 points higher on average. Students with flat trajectories did not improve more when their dedicated period was longer, so review strategy should be reassessed before moving the date.

What does a low baseline score predict?

Among 784 reports whose first score looked like a baseline diagnostic, those starting below 215 finished at a median of 250, an average increase of about 42 points. Only 4% finished below 230. Lower baseline scores were followed by larger improvement but lower final scores.

Combine your scores

Combine your practice scores and test dates in the full predictor. Open the predictor →

Charts & guides

Browse the score analyses, study-data pages, and assessment converters.