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Within one conversation with him, my score managed to jump up 7 points on my practice step 1 exam (CBSSA).
Cole D.
The official Step 1 practice exams are the NBME Comprehensive Basic Science Self-Assessments (CBSSA): seven forms, each 200 questions in four 50-question sections, from $62 a form (NBME CBSSA). USMLE adds more than 100 free sample questions, the set students call the Free 120 (USMLE sample questions). Commercial question banks sell their own self-assessments as well, such as UWorld’s UWSA forms.
Because Step 1 is now pass/fail, what you want from a practice exam is a reliable read on whether you would pass today. This page covers what each official test gives you, how long it takes, how its results map to a pass, and how to space them across a dedicated period.
Official Step 1 practice exams at a glance
| Topic | Official rule | Source |
|---|---|---|
| NBME CBSSA forms | Seven Comprehensive Basic Science Self-Assessment forms; price starts at $62. The score report gives an estimated probability of passing Step 1 and an equated percent correct score by content area. | NBME: CBSSA |
| CBSSA format | Four sections of 50 questions. Standard-paced: 1 hour 15 minutes per section. Self-paced: up to 5 hours per section. | NBME: CBSSA |
| Free USMLE sample questions | More than 100 Step 1 sample questions, as a PDF and as an interactive testing experience; a new version matches the 30-minute blocks used from May 14, 2026. | USMLE: Step 1 sample test questions |
| Prometric practice session | A paid practice session at a Prometric center, using the same sample test materials as USMLE.org; it can be booked only after you receive your scheduling permit. | NBME: self-assessment FAQs |
| Passing standard | Pass/fail only since January 26, 2022. USMLE states the passing standard is 196 on the three-digit scale and will not report future reviews as a three-digit score. | USMLE: results and scoring |
| Share correct to pass | Examinees typically must answer approximately 60% of questions correctly to pass Step 1. | USMLE 2026 Bulletin of Information |
| Real exam format | One 8-hour day. From May 14, 2026: fourteen 30-minute blocks of no more than 20 questions, with at least 55 minutes of break time. | USMLE: Step 1 |
| Results | Typically within four weeks of the test date; USMLE advises allowing at least eight weeks. | USMLE: results and scoring |
The official Step 1 practice tests
| Practice test | Made by | Questions | Cost | What you get |
|---|---|---|---|---|
| CBSSA (seven forms) | NBME | 200 in four sections of 50 | From $62 a form | Estimated probability of passing, equated percent correct by content area, answer explanations |
| Step 1 sample test questions (“Free 120”) | USMLE | More than 100 | Free | PDF plus an interactive version in the current exam software |
| Prometric practice session | USMLE / Prometric | Same sample materials | Paid | The sample test at a real test center, bookable after your scheduling permit |
The CBSSA is the one that gives a number. Each report shows your estimated probability of passing Step 1 and your equated percent correct compared with other test takers (NBME CBSSA). The USMLE sample questions do not give a pass estimate, but they run in the real exam software, and USMLE published a new interactive version for exams from May 14, 2026 so you can practise the 30-minute blocks (USMLE).
How long NBME Step 1 practice exams take
A CBSSA form is four sections of 50 questions. In standard-paced mode each section gets 1 hour and 15 minutes, so the full form is 5 hours of testing; self-paced mode allows up to 5 hours per section (NBME CBSSA). Take the standard-paced version whenever you want a prediction you can trust. Self-paced results look better than they are, because the real exam is timed.
The timing matches the real exam closely. The CBSSA allows 75 minutes for 50 questions, 90 seconds a question. The Step 1 format introduced on May 14, 2026 uses 30-minute blocks of no more than 20 questions, which is also 90 seconds a question (USMLE Step 1). What differs is the length of each sitting: the real exam breaks the day into fourteen short blocks, the CBSSA into four long sections. Use the USMLE sample questions to get used to the block length.
What practice score means you will pass Step 1?
Step 1 reports only pass or fail. USMLE says the passing standard is 196 on the old three-digit scale and that future reviews will not be reported as a three-digit score (USMLE scoring). The 2026 Bulletin adds a rough guide: examinees typically need to answer about 60% of questions correctly to pass (2026 Bulletin).
On a CBSSA, read the estimated probability of passing, not the raw score, and read it as a trend. One form at a comfortable probability is encouraging; three forms in a row there, taken under standard timing, is the evidence you want before keeping your date. A single low form after a bad night’s sleep is noise. Two in a row is a signal to change the plan, and possibly the date.
For context, 93% of first-time takers from US MD schools and 89% from US DO schools passed in 2025, against 75% of first-time takers from non-US schools (USMLE performance data).
Order and spacing: a practice-exam plan for dedicated
A simple rule works for most students: one baseline form before dedicated starts, then roughly one form a week, each followed by a full review the same or next day, with the USMLE sample questions in the final week so the real software feels familiar. Our sample six-week Step 1 schedule shows that rhythm, with CBSSA forms and the two UWorld self-assessments placed between the system blocks.
Reviewing a practice exam
A practice exam you do not review is mostly wasted. Sort every miss into one of three groups:
- Knowledge: you did not know the fact or mechanism. Add it to your content list for that system.
- Reasoning: you knew the fact but misread the question, missed a clue, or chose between the last two answers on instinct. These are the misses tutoring fixes fastest.
- Timing: you rushed, ran out of time or changed a right answer. Look at where in the section these cluster.
Then compare forms. If knowledge misses fall while reasoning misses stay flat, more content review will not move the probability of passing; working questions out loud with someone checking your logic will.
When a tutor helps
If you already own a question bank and the CBSSA forms, what is often missing is someone to read the results with you. In sessions we work live questions while you talk through your reasoning, find where the reasoning breaks, and set the next form’s date from the data rather than the calendar. Sessions are online by live video (Zoom or Google Meet), and you can text questions between them.
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