USMLE Step 2 CK practice test in the 2026 block format

Start with a free block of 20 questions

The free block is 20 questions in 30 minutes, one whole block of the 2026 format, in the same player as the full mock: a lab values panel, mark for review, highlight and strike-out, and the block locks when its time runs out. Then you get your score, your result by system and competency, and an explanation for every question. No account and no card.

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What a Step 2 CK practice test should look like in 2026

Step 2 CK is about 316 multiple choice questions in sixteen 30 minute blocks, one testing day of about 9 hours. Each block holds up to 20 questions, answers can be reviewed only inside the block, and the score comes back on a three digit scale with a passing score of 218. A practice test still built on 40 question, 60 minute blocks follows the format used before May 7, 2026.

The mock follows the blocks and the review rules: 16 blocks of 30 minutes (twelve of 20 questions and four of 19), answers that lock when a block ends, a lab values panel. It scores raw and percent only, never on the three digit scale.

Format facts, and where each one comes from

• The USMLE 2027 Bulletin of Information gives Step 2 CK as approximately 316 multiple choice questions in sixteen 30 minute blocks, a one day exam of approximately 9 hours. The older total of 318 belongs to the eight block format used before May 7, 2026.Source: https://www.usmle.org/sites/default/files/2026-08/2027Bulletin.pdf
• Diagnosis is 16 to 20 percent of items, laboratory and diagnostic studies 13 to 17 percent, and mixed management 12 to 16 percent. Medical knowledge and history and physical exam are weighted at 0 percent.Source: https://www.usmle.org/exam-resources/step-2-ck-materials/step-2-ck-content-outline-specifications
• Nutrition is a cross cutting discipline at 15 to 20 percent: a nutrition coded item is also coded to one of the organ systems.Source: https://www.usmle.org/exam-resources/step-2-ck-materials/step-2-ck-content-outline-specifications

Format checked on September 12, 2026. These pages are reviewed once a quarter by the person who runs MedUni Exam, and the review is what moves the date above. If a number here is out of date, write to support@meduniexam.com and it gets fixed.

How a generated mock follows the content outline

USMLE publishes a range for each competency and each system (Step 2 CK content outline, read October 11, 2026). A generated mock takes the middle of every range and scales it to 316 questions, so every competency and every system is in each mock in proportion.

And by system

Each question also carries a clinical science, as the outline codes them (medicine 55 to 65 percent, pediatrics 17 to 27, obstetrics and gynecology 10 to 20, psychiatry 10 to 15, surgery 5 to 15; one question can carry two, so these overlap), and about one in six carries a nutrition code. Medical knowledge on its own is weighted at zero.

What the questions look like

We measured the 120 questions of the official sample booklet (USMLE sample questions, read October 11, 2026): the scenario has a median of 138 words, every lead-in is built on "Which of the following", none is negative, and most options are short. A generated mock follows those numbers. The questions below are invented to show each kind of question a mock holds; none is a USMLE item.

Generate a free sample 20 questions in 30 minutes, no sign-up

How each mock is written and checked

When you click Generate, a new mock is written for you: about 316 questions spread over the competencies and systems above, in the style measured on the official sample, to current US practice. Every question is written by AI models and then answered blind by a second model from another family. If that answer differs from the key, the question is thrown away and written again. One more review looks for flaws, ambiguity, factual errors and answers that depend on a guideline the question does not name. No question is copied from a real or recalled exam, and two questions in one mock may not test the same thing.

You do not wait for all 16 blocks: block 1 can start as soon as its questions are ready, and the later blocks are written while you work. A second mock is a new one, never the first one again.

The PDF booklet and your score report

The full mock also downloads as a PDF: a US Letter booklet in one column, with the options listed from (A), an answer form and an answer key with an explanation for every question at the back. Every page says it is a MedUni Exam practice paper, not an official exam paper.

Your report gives your raw score out of 316 and your percent correct, by block, by competency, by system and by clinical science, with the number of questions behind every row. USMLE says examinees typically need about 60 percent correct to pass and that the share varies by form; the mock is not equated to any form, so it prints that line as a reference only and gives no three digit score, percentile or pass probability. For an official estimate, NBME's Comprehensive Clinical Science Self-Assessment reports an estimated probability of passing (NBME CCSSA).

When you can take Step 2 CK

Step 2 CK has no fixed sittings: you book a day at a Prometric center, year-round. USMLE expects designated testing dates no earlier than January 2029 (USMLE designated testing dates).

• The last eligibility period of the 2026 fee year ends December 31, 2026.
• For the 2027 Match: eight weeks before the rank list deadline, the time USMLE allows for a score to arrive, is January 6, 2027 (computed).

What the mock cannot do

• It has no connection to USMLE, the FSMB or the NBME, and no question comes from a real or recalled exam.
• No pictures, audio or video: about 12 percent of the official sample questions carry a picture, and the interactive exam adds audio and video findings; here those findings are described in words.
• No equating: the real result is a three digit score with a passing score of 218, while the mock gives raw and percent scores, and its difficulty is not calibrated against a national cohort.
• A real form carries unscored questions that USMLE does not count or name; the mock scores all 316.
• The player is modeled on USMLE's written descriptions of the 2026 software and NBME's matching interface; the real screen's button placement was not verified.
• The style numbers come from the 120 public sample questions, last updated in 2023 in the older block format.
• Our laboratory reference table is written independently, so a few ranges may differ from the table used on test day.
• At home you can pause or split the day, which the real 9 hour exam does not allow.
• Questions are checked by models, not by a doctor. The checks remove most errors, not every one.

Questions about the Step 2 CK practice test

Is there a free Step 2 CK practice test?

Yes, two kinds. USMLE publishes 120 free sample questions, the set students call the Free 120. Here, the first block is free: 20 new questions in 30 minutes, scored, with an explanation for every answer, and no sign-up.

Are these real Step 2 CK questions?

No. Every question is written new to the published Step 2 CK content outline and checked before you see it. Real and recalled exam questions are never used.

How many questions and how much time does the free block give me?

20 questions and 30 minutes, the block length of every Step 2 CK taken on or after May 7, 2026, when each block holds 18 to 20 questions. That is 90 seconds a question.

How is the full mock laid out?

316 questions in 16 blocks of 30 minutes: twelve blocks of 20 and four of 19, inside the 18 to 20 a block that USMLE gives. You get a lab values panel, mark for review, highlighting and strike-out, and blocks that lock when they end.

Is every mock the same?

No. Each time you click Generate, a new mock is written for you, so a second mock is a different set of questions in the same format.

Does the mock predict my Step 2 CK score?

No. It reports your raw score and percent correct, by block and by content area. It is not equated to any USMLE form, so it prints no three digit score, percentile or pass probability. USMLE says examinees typically need about 60 percent correct to pass, and that share varies by form.

Can I print the mock?

Yes. The PDF booklet is laid out on US Letter in one column, with the options in a list from (A) and an answer form and key at the back. Every page says it is a MedUni Exam practice paper, not an official exam paper.

Does it include image, audio or video questions?

No. The questions are text only. On the real exam a portion of questions use pictures, and the interactive exam includes audio and video findings. Here, the finding a picture would show is described in words.

All exam pages · Step 2 CK percentiles and passing score

Published September 12, 2026, updated October 22, 2026.