The Clinical Basic Science Self-Assessments (CBSSA), released by the NBME, should be integral to any USMLE Step 1 study plan. These tests are traditionally referred to as NBME practice tests. They consist of retired exam questions reformatted into practice assessments and in the past, your NBME score report provided you with a good prediction of how you’d do on test day.
With Step 1 now being a pass/fail exam, these practice exams are being scored a bit differently and many wonder what their results now mean in terms of their exam preparedness. Read on to learn more about these changes and the way they may influence the interpretation of your NBME score report.
What is an NBME score report?
“NBME score report” can refer to a few different things, and mixing them up is where a lot of confusion starts. There are:
- NBME Self-Assessments are practice exams (Comprehensive Basic/Clinical Science Self-Assessments CBSE and CBSSAs) students use to gauge readiness for Step exams
- Subject exams (shelf exams) are the required end-of-clerkship tests for each core rotation that have their own score reports
- Comprehensive Clinical Science Self-Assessment Examinee Performance Report (CCSSA score report which mirrors Step 2 CK preparedness)
These are all built and scored by the NBME, but they are not the same as your official USMLE Step score report. Step reports have their own scale and reporting structure. NBME practice materials are designed to estimate how you’d perform, not to replace or perfectly mirror the real thing.
The NBME uses scaled scores rather than a simple percentage correct, which is the first thing that trips people up. Let’s start there.
What are the main components of my NBME score report?
Most NBME score reports include a handful of key elements:
- Overall scaled score: Number that reflects your performance, adjusted for exam difficulty
- Predicted USMLE passing: “Based on your performance on this CCSSA, your estimated probability of passing Step 2 CK if you test within a week is X%”
- Performance by discipline or organ system: Breakdown showing relative strengths and weaknesses across content areas (this is key to know what areas to work on as you continue to study)
Each of these tells you something different, and each has limitations worth understanding before you build a study plan around it.
Because the Step 1 examination is now pass/fail, the score reports for the associated practice tests have converted to a similar format and no longer use three-digit scores. Instead, you’ll receive the two following numbers on your NBME score report:
Equated Percent Correct Score
Here’s the part that confuses almost everyone: your scaled score is not the percentage of questions you got right.
NBME exams use a process called equating, which adjusts scores based on the difficulty of the specific set of questions you saw. Different forms of the same exam aren’t identical in difficulty, so a raw percentage wouldn’t be a fair way to compare performance across different test dates or versions. Equating tries to correct for that.
In other words, if you have a harder test, your true percentage will be curved up to a higher equated percent correct score.
Discipline and Content Area Breakdown
This is often the most actionable part of the report. The breakdown shows how you performed across categories like organ systems or disciplines. In practice, this section should tell you where to focus your remaining study time.
Be aware that sample sizes per category are small. A subject area might only include 8-15 questions on a given exam. Missing three questions in a small category can make your performance in that area look far worse than your actual grasp of the topic. Look for patterns across multiple practice tests before concluding you have a genuine content gap.
Probability of Passing Step 1 or Step 2
The probability of passing Step 1 is easier to interpret: it’s simply an estimation of your likelihood to pass the exam if you’re going to take it in the next week. This number is difficult to convert back to a three-digit score like the old graded version of the exam, but a 50 percent likelihood of passing should be roughly equivalent to the previous passing score of 194.
Check out a sample NBME score report below!
Source: NBME
What will my exam day score report include?
Because the exam is pass/fail, your Step 1 score report after taking the actual exam will specify only whether you passed. It will not include your equated percent correct score. In other words, passing scores will not be stratified, and you will not receive any numerical representations of your performance.
If you fail the exam, however, the report will provide more information to help you understand the result and to identify areas for improvement for when you take the exam again. You’ll receive graphical representations of how you performed relative to your peers overall and within different disciplines to determine your strengths and weaknesses.
To view a Step 1 score report for a passing score vs a failing score, check out these sample reports from NBME!
How do I use my NBME score report?
You should schedule the exam once you’ve taken enough practice tests and scored comfortably within passing range. A general rule of thumb is to try to have at least 3 practice tests with a 95 percent or greater likelihood of passing by the time you take the real deal. However, the ideal threshold may change with time as we get more accustomed to this format.
Regardless, if you’re consistently achieving a greater than 98 or 99 percent likelihood of passing on multiple practice tests, this is a strong indicator you’re ready to proceed with Step 1.
Remember that even though Step 1 is pass/fail, the preparation itself remains the same as those who took the graded exam. You should still rely on Step 1 question banks, textbooks, and video resources used in the past, as well as additional Step 1 mock exams!
Common Mistakes to Avoid
A few patterns come up again and again with students reading their score reports:
- Don’t: Treat a single score as destiny. One below-target score early in dedicated study doesn’t predict your final outcome.
- Don’t: Overreact to one weak subject area for one practice exam. Follow the trend instead.
- Don’t: Compare scores across different forms as if they’re interchangeable. Even with equating, no two exams are perfectly identical experiences. Some day-to-day variation is normal.
- Don’t: Confuse a predicted score range with a guarantee. Predicted Step scores come with a margin of error. A predicted range isn’t a promise.
Instead:
- Do: Recognize that timing matters. A low score at the very start of dedicated study is expected and shouldn’t trigger panic. A low score close to your actual test date, especially if it fits a consistent pattern across several practice exams, deserves serious attention and possibly a conversation about timeline or additional prep.
- Do: Build a targeted study plan around content areas that show up as weak repeatedly, not just once.
- Do: Track trends across multiple exams rather than fixating on any single report. A rising trajectory across practice tests is often more informative than where you happen to land on one of them.
- Do: Loop in an advisor or tutor if a pattern of scores is significantly below benchmarks, or if you’re unsure how to translate the data into a study plan for test day. We’ve seen many reports and can help you interpret.
Best of luck as you head into your Step 1 dedicated study time—you got this!
Originally published June 2024 / Updated August 2026
