USMLE Step 1 guide: the exam, the systems and the best way to revise
Everything you need to plan your Step 1 prep: how the exam day works, what it covers, and a study plan built on the two methods with the strongest evidence behind them, active recall and spaced repetition.
Exam rules change. Check the official USMLE website for current dates, fees and policies. [OWNER: VERIFY EVERY FACT MARKED LIKE THIS AGAINST USMLE.ORG BEFORE LAUNCH, AND ADD THE DATE YOU CHECKED]
What USMLE Step 1 is
Step 1 is the first exam of the United States Medical Licensing Examination, run by the Federation of State Medical Boards (FSMB) and the National Board of Medical Examiners (NBME). It tests whether you can apply the basic sciences (anatomy, physiology, biochemistry, pathology, pharmacology, microbiology, immunology, behavioral science and more) to clinical problems.
US MD and DO students usually sit it after the pre-clinical years. International medical graduates (IMGs) take it as part of ECFMG certification. [CHECK CURRENT ELIGIBILITY AND REGISTRATION ROUTES: NBME FOR US/CANADIAN STUDENTS, ECFMG FOR IMGS]
The exam day
at a Prometric test center
multiple-choice questions
of 60 minutes each
no three-digit score since 2022
in total, including breaks [VERIFY]
registration fee [VERIFY CURRENT FEE]
Each block has up to 40 questions, so you have roughly 90 seconds per question. Most are clinical vignettes: a patient scenario, sometimes with lab values or an image, followed by one question and several options with a single best answer. You get a pool of break time to use between blocks, plus an optional tutorial at the start. [VERIFY: 45 MINUTES OF BREAK TIME, 15-MINUTE TUTORIAL]
Since January 2022 Step 1 is reported as pass or fail only. That changed how students study: the aim is now a safe pass and knowledge that lasts into Step 2 CK and the wards, rather than chasing a number. [VERIFY THE CURRENT MINIMUM PASSING STANDARD]
What it covers: the 11 systems
The USMLE content outline organizes Step 1 by organ system, with basic science disciplines running through each one. Ebb Deck uses the same 11 systems, so you can build tests and track mastery the way the exam is laid out. The counts below are the questions in Ebb Deck today.
| System | Questions in Ebb Deck |
|---|---|
| Human Development | 69 |
| Blood & Immune Systems | 150 |
| Behavioral Health & Nervous Systems | 194 |
| Musculoskeletal, Skin & Subcutaneous Tissue | 111 |
| Cardiovascular System | 132 |
| Respiratory & Renal Systems | 164 |
| Gastrointestinal System | 152 |
| Reproductive & Endocrine Systems | 173 |
| Multisystem Processes & Disorders | 216 |
| Biostatistics & Epidemiology | 89 |
| Social Sciences & Communication | 50 |
| All systems | 1,500 |
The official outline also gives a percentage range for each system on the exam. [OPTIONAL: ADD THE CURRENT SYSTEM WEIGHTINGS FROM THE USMLE CONTENT OUTLINE]
How to revise for Step 1
The best way to revise for USMLE Step 1 rests on two well-tested ideas from memory research.
Active recall: test yourself, don't re-read
Retrieving an answer from memory strengthens it far more than reading it again. For Step 1 that means doing board-style questions every day and reading every explanation, including for the questions you got right. Re-reading notes or highlighting feels productive but gives much less back.
Spaced repetition: review just before you forget
In 1885 Hermann Ebbinghaus showed that we forget most new material within days unless we review it, and that each well-timed review makes the memory last longer. Reviewing at growing intervals (a day, a few days, a week, a month) keeps a huge volume of facts retrievable with far less total time than cramming.
Put them together
- Do new questions every day, in blocks by system early on and mixed later.
- Rate how sure you were. A lucky guess should come back soon; a confident correct answer can wait.
- Clear your due reviews before starting new questions, so nothing slips.
- Keep the daily load steady: consistency beats long weekend sessions.
- Sit timed blocks in the last weeks to build exam stamina, and take the official NBME self-assessments to check your readiness. [VERIFY CURRENT NAMES OF THE NBME SELF-ASSESSMENTS]
A dedicated-period plan
Many students build a foundation during their pre-clinical courses, then take a dedicated study period of roughly four to eight weeks. Here is a six-week outline. Stretch or compress it to fit your date.
| When | Focus | Daily questions |
|---|---|---|
| Before dedicated | Start spaced repetition early: a small daily set alongside your courses, by the system you are studying. | 10 to 30 |
| Weeks 1 and 2 | Go system by system. Tutor mode, read every explanation, flag what is new. Clear reviews first every morning. | 40 to 80 |
| Weeks 3 and 4 | Mixed blocks across all systems. Drill your three weakest systems. Take a first self-assessment. | 80 to 120 |
| Week 5 | Timed 40-question blocks at exam pace, with full review afterwards. Keep up with due reviews. | 120 |
| Week 6 | Lighter new load, mostly reviews and weak spots. A final self-assessment, then rest the day before. | 40 to 80 |
These are typical ranges, not rules. If your reviews pile up, do fewer new questions until they are under control.
Where Ebb Deck fits
Ebb Deck is a USMLE Step 1 question bank built around this method. Every one of its 1,500 questions is scheduled by an SM-2 spaced-repetition engine, and your confidence rating decides how soon it comes back. It runs in the browser for timed blocks at your desk and on iPhone for reviews on the go, with one account and progress that syncs both ways. Use it on its own or alongside a bigger bank for daily reviews that keep high-yield facts from fading.