USMLE Step 2 CK mock exam: all 316 questions
316 questions · 16 blocks of up to 20 · 30 minutes per block
The 2026 USMLE format: 316 single-best-answer questions in 16 timed 30-minute blocks, with each content area’s share of the exam from the USMLE content outline. You get your percentage correct, your score in every content area and a worked review of every question with a note on every option.
Before you start
- Every question is a clinical vignette with five options and one best answer. Step 2 CK questions ask for the diagnosis, the next test or the next step in management by current US practice. When you submit, every question opens with why the key is best, a note on every option and the reference behind it. A lab values panel is one click away, as on test day.
- As in the 2026 test software, each block has its own 30-minute clock. Inside a block you can skip, go back, change answers and mark questions. Ending a block, or its clock running out, closes it for good; the next block starts when you are ready, so breaks are untimed here. Your sitting is kept in this browser across reloads.
Create a free account before you start
Create a free account to start. Every drill includes one free attempt. A USMLE pass unlocks the full-length Step 1 and Step 2 CK mock exams and unlimited drills in every content area.
Original practice questions written to the USMLE content outlines and current standard references. USMLE® is a joint program of the Federation of State Medical Boards (FSMB) and NBME. Independent practice, not affiliated with or endorsed by the FSMB, NBME or Intealth (ECFMG).
Free USMLE Step 2 CK sample questions
Five questions in the mock’s format, with the answer, explanation and source after each. No account needed.
A 42-year-old man has had episodes of pounding headache, sweating, and palpitations for 6 months. Blood pressure is 168/104 mm Hg, and pulse is 102/min. Plasma free metanephrines are eight times the upper limit of normal. CT shows a 4-cm heterogeneous right adrenal mass. Adrenalectomy is planned in 2 weeks. Which of the following is the most appropriate initial preoperative pharmacotherapy?