USMLE® Step 1 Instructor-Led Courses

The USMLE consists of three distinct steps: Step 1, Step 2 CK (clinical knowledge), and Step 3, which are designed to be taken sequentially throughout a physician’s medical training. 

Step 1 is a pass/fail assessment of foundational sciences, while Step 2 CK provides a critical numerical score for residency applications by focusing on clinical management. The final hurdle, Step 3, is a comprehensive 2-day exam that assesses the ability to practice medicine independently, and successful completion of all three steps is the mandatory requirement for obtaining an unrestricted medical license in the U.S.

The USMLE Step 1 evaluates the foundational sciences required for medical practice, with a heavy emphasis on the principles and mechanisms of disease. The exam covers core disciplines including Pathology, Physiology, Pharmacology, Biochemistry, Microbiology, and Immunology, which are primarily tested through integrated organ-system modules like Cardiovascular and Renal. Rather than simple fact recall, the exam uses complex clinical vignettes to ensure candidates can apply these basic science concepts to real-world patient care scenarios.

The USMLE Step 1 is administered by appointment on a year-round basis. For U.S. and Canadian medical students, the ideal time to take the USMLE Step 1 is immediately following the completion of the preclinical basic science curriculum, typically in the late spring or early summer of your second year (M2). This ensures that foundational knowledge is fresh during a dedicated study period of 6 to 8 weeks before beginning clinical rotations. 

For International Medical Graduates (IMGs), the timeline for taking the USMLE Step 1 is more flexible but should be strategically planned to allow at least 6 to 12 months for comprehensive preparation, ensuring the exam is completed well in advance of the September Electronic Residency Application Service (ERAS^®) residency application deadline. 

Regardless of your background, the most reliable indicator of when to test is achieving a consistent pass probability of 85% or higher on self-assessments, allowing you to schedule your USMLE Step 1 exam within your chosen three-month eligibility window.

As of the May 2026 update, the USMLE Step 1 consists of 14 blocks, a shift from the traditional 7-block format designed to reduce examinee fatigue. Each block contains a maximum of 20 multiple-choice questions with a 30-minute time limit, resulting in a total of 280 questions across the entire 8-hour testing session. While the total number of questions and overall exam length remain the same, this restructured pacing provides more frequent mental resets and natural stopping points throughout the day.

The USMLE Step 1 consists of a maximum of 280 multiple-choice questions administered in a single 8-hour testing session. Starting May 2026, the exam moved to a new format where these questions are divided into fourteen 30-minute blocks, with each block containing no more than 20 questions. This structure replaced the previous seven 60-minute blocks to help reduce examinee fatigue and provide more frequent mental resets throughout the day.