USMLE Step 3 Practice Questions & CCS Cases

How to pass the USMLE Step 3 exam on the first try

1. Practise with the free Primum CCS software from usmle.org before Day 2 of USMLE Step 3. Each of the 13 to 14 cases is capped at 10 or 20 minutes of real time, and learning the order-entry screen during the exam costs you actions.
2. CCS cases are scored on what you order and when you order it, so shotgun orders on USMLE Step 3 count as inappropriate or harmful. Advance the clock deliberately and reassess the patient after each intervention.
3. Day 1 of USMLE Step 3 is 232 items in twelve 30-minute blocks and leans on biostatistics, evidence-based medicine, ethics, and patient safety. Treating it as a warm-up for Day 2 is a common cause of a failing score.
4. Two testing days of different shapes make up USMLE Step 3, about 7 hours on Day 1 and about 9 hours on Day 2, where nine blocks run before the CCS cases. Simulate each day at its real length at least once.
5. One structured pass through the areas outside your own program separates a comfortable pass from a repeat. USMLE Step 3 samples all of medicine: ambulatory pediatrics, obstetrics, psychiatry, and preventive care are all in scope.

About the USMLE Step 3 exam

USMLE Step 3 is the final examination in the United States Medical Licensing Examination sequence, co-sponsored by the FSMB and the NBME. It tests whether you can apply medical knowledge to the unsupervised practice of medicine (the ambulatory patient with several problems, the emergency presentation, the inpatient whose course changes overnight, the newborn at a well visit), and passing it is required for a full, unrestricted medical license in every U.S. state. Most candidates take it during the first or second year of residency, after Step 1 and Step 2 CK and after earning the MD or DO degree.

Step 3 is unlike the earlier Steps in structure as well as content. It runs over two separate testing days with different designs. Day 1, Foundations of Independent Practice, is entirely multiple choice and leans on biostatistics, evidence-based medicine, ethics, and the scientific basis of diagnosis and management. Day 2, Advanced Clinical Medicine, mixes multiple choice with 13 to 14 computer-based case simulations (CCS) in which you manage a patient over simulated time. The practice bank on this page follows the same content areas as the USMLE outline, and it includes the ambulatory and preventive medicine items that residents who spend most of their time on inpatient services tend to under-prepare.

The content areas USMLE Step 3 covers across both days

Source: USMLE Step 3 Content Description and General Information

Content areas are our question-bank organization of the USMLE outline, which classifies each Step 3 item by system and by physician task or competency, and publishes approximate percentage ranges for each axis. Because those axes overlap, the ranges are not reproduced here. The current outline is available from usmle.org. Foundations of Independent Practice items are weighted toward the first three rows. Advanced Clinical Medicine items and CCS cases are weighted toward diagnosis and management across the system rows.

How the USMLE Step 3 exam is scored

Step 3 is reported as a three-digit score. For examinations taken on or after January 1, 2024, the minimum passing score is 200. USMLE reviews the passing standard periodically, so confirm the current value on usmle.org when you register. Multiple-choice items and CCS cases are combined into a single score. The report also includes a performance profile by content area and by item format.

Multiple-choice items are single-best-answer questions, some built on scientific abstracts or pharmaceutical advertisements, and some on multimedia. Each CCS case is scored on whether your actions were appropriate and on when you took them: the right tests and treatments, ordered in the right location and at the right point in the patient's course, with no harmful or unnecessary orders. There is no penalty for wrong multiple-choice answers, and some items on every form are unscored pretest questions.

Registration and exam rules

Administered by

FSMB and NBME, at Prometric test centers in the United States and its territories. Step 3 registration follows the same 2026 service-transition split as the other Steps: graduates of LCME- or COCA-accredited U.S. schools apply through NBME on the MyUSMLE portal, and graduates of medical schools outside the United States apply through FSMB's USMLE portal. Before 2026 FSMB handled Step 3 for everyone, so older advice on where to apply is out of date.

Eligibility

You must hold an MD or DO degree (or equivalent) from an LCME- or COCA-accredited school or a school listed in the World Directory of Medical Schools as meeting ECFMG eligibility requirements, have passed Step 1 and Step 2 CK, and, if you are an international medical graduate, hold ECFMG Certification. Some state medical boards add requirements such as a year of postgraduate training before Step 3. Check the board you plan to license with.

Day 1: Foundations of Independent Practice

About 7 hours: an optional 5-minute tutorial, then 232 multiple-choice items in twelve 30-minute blocks of 18 to 20 items, with 55 minutes of break time. Unused tutorial or block time is added to your breaks.

Day 2: Advanced Clinical Medicine

About 9 hours: an optional 5-minute tutorial, 180 multiple-choice items in nine 30-minute blocks of 20 items, a 6-minute CCS tutorial, and then 13 to 14 computer-based case simulations (CCS) each allowed a maximum of 10 or 20 minutes of real time, with a minimum of 45 minutes of break time.

Scheduling

The two days do not have to be consecutive. USMLE allows them to be scheduled separately within the limits published at registration. Practising with the free Primum CCS software from usmle.org before Day 2 is strongly recommended, because the interface catches more unprepared candidates than the medicine does.

Attempt limits

You get at most four attempts at each Step. You may not take Step 3 more than three times in a 12-month period. Any fourth attempt must be at least 12 months after the first and 6 months after the most recent. Passing a Step closes it to further attempts.

The 6-week USMLE Step 3 study plan for residents

Residents prepare for Step 3 around clinical duties, so the plan below assumes six weeks at 15 to 20 hours a week and puts the highest-value, least-practised content first. Biostatistics opens the plan, then ambulatory and preventive medicine with a daily CCS case.

1. Week 1Diagnostic and Day 1 foundations. Take four timed 20-item mixed blocks (the block size on both exam days) to see where you stand, then work Biostatistics, Epidemiology and Population Health, Evidence-Based Medicine, and Ethics and Patient Safety. These areas are a large share of Foundations of Independent Practice and are almost never reviewed on the wards.
2. Weeks 2–3Ambulatory Care and Preventive Medicine, then the outpatient side of Cardiovascular, Endocrine and Metabolic, Respiratory, Renal, and Gastrointestinal medicine: screening schedules, chronic disease targets, medication adjustments, and follow-up intervals. Start one CCS practice case a day using the Primum software.
3. Week 4Obstetrics and Gynecology, Pediatrics and Neonatal Medicine, Behavioral Health and Psychiatry, and Emergency Medicine and Toxicology. Residents in a single specialty lose the others quickly. This week restores them. Keep the daily CCS case running.
4. Week 5Hematology and Oncology, Nervous System, Musculoskeletal and Rheumatology, Skin, and Perioperative Care. Practise timing in CCS. Advance the clock deliberately and reassess after each intervention. Move the patient to the correct location as the case evolves.
5. Week 6One full Day 1 simulation (twelve 30-minute blocks) and one full Day 2 simulation (nine 30-minute blocks plus a set of timed CCS cases) on separate days, each followed by review. Taper for the final two days before each testing day.

Where USMLE Step 3 candidates lose points

• Walking into Day 2 without having used the CCS software. The cases are scored on the orders you write and when you write them, and candidates who are learning the order entry screen and the clock during the exam lose time and miss actions they would take in real life.
• Assuming residency alone is enough. Residents are strong in their own specialty and rusty everywhere else, and Step 3 samples the whole of medicine, including ambulatory pediatrics, obstetrics, psychiatry, and preventive care. One structured pass through the areas outside your program is the difference between passing comfortably and repeating.
• Neglecting Foundations of Independent Practice. Day 1 is heavy on biostatistics, abstract interpretation, ethics, and patient safety, which is short, formulaic content that is easy to score on and easy to skip. Treating Day 1 as a warm-up for Day 2 is a common cause of a failing overall score.
• Over-ordering in CCS cases. Shotgun orders are scored as inappropriate or harmful. The case rewards the workup and treatment a reasonable physician would order in sequence, with reassessment between steps. Everything at once scores badly.
• Ignoring the two-day format in practice. Both days use 30-minute blocks, but Day 1 runs twelve of them and Day 2 runs nine followed by the CCS cases, which land at the end of the longer day when fatigue is highest. Simulate each day at its real length at least once.

Learn the USMLE Step 3 the way its item writers think

Step 3 item writers are testing whether you can be left alone with a patient, so the distractors are the things a tired resident actually does: the reflexive imaging order before the airway is secured, the specialist referral for a problem the outline expects you to manage in clinic, the screening interval that was right for a different age group, the answer that is true of the disease but ignores the ambulatory setting in the stem. Our Step 3 items are written with those decoys and, when you miss one, explain why the option you picked was the wrong choice for this setting and patient. On Pro each wrong option is tagged with its trap: scope confusion, stem misread, misconception, or a partial answer that stops before the reassessment.

The same tagging exposes the habits that cost points in CCS: everything ordered at once, the clock advanced without reassessment, a discharge before results are back, or the patient left in the wrong location. Trap-pattern analytics show, for instance, that your Ambulatory Care misses are mostly screening-interval scope errors while your Emergency Medicine misses are sequencing errors, and the variant engine then generates new cases around exactly that decision until it holds. Hints remove the most tempting order or option and return you to the question of what a reasonable physician does next, which is the standard the exam is written to.

USMLE Step 3 exam FAQ

Further reading

• USMLE Step 2 CK practice questions
• USMLE Step 1 practice questions
• Average Step 2 CK score by specialty (NRMP match data)
• Plans and pricing for full question-bank access