The Breakdown of Experimental Questions on Step 2
The United States Medical Licensing Examination (USMLE) Step 2 Clinical Knowledge (CK) exam is a standardized exam that assesses a medical student’s or physician’s ability to apply medical knowledge and concepts to patient care. The exam consists of 280 multiple-choice questions, of which 56 (20%) are experimental questions. These experimental questions are not scored and do not count towards the final score.

Locations of Experimental Questions on Step 2
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Formative Assessment Questions:
The experimental questions are distributed throughout the eight blocks of the exam and are not identified as such. Candidates will not know which questions are experimental. -
Pretest Questions:
The USMLE also uses experimental questions to pretest new items for future exams. These pretest questions may appear on the exam but will be removed from the scoring process after the exam is administered.
Functions of Experimental Questions on Step 2
Benefits:
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Test Format Evaluation:
Experimental questions allow the USMLE to evaluate the effectiveness of different question formats and styles. -
Future Exam Development:
The data collected from experimental questions informs the development of future exams, ensuring that the test continues to be valid and reliable.
Pain Points:
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Uncertainty:
Candidates may experience uncertainty and anxiety when encountering experimental questions, as they are not sure whether the questions will count towards their final score. -
Time Management:
Candidates who spend too much time on experimental questions may sacrifice time for scored questions, potentially affecting their overall performance.
How to Approach Experimental Questions on Step 2
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Treat All Questions Seriously:
Since candidates cannot identify experimental questions, it is crucial to approach all questions with the same level of effort and attention. -
Manage Time Effectively:
Stay mindful of time and allocate it wisely between experimental and scored questions. Prioritize the questions that will impact your score. -
Educated Guessing:
If you are running out of time or unsure about an experimental question, make an educated guess based on your knowledge and the available answer choices.
Conclusion
Experimental questions on Step 2 CK constitute 20% of the exam. They serve the purpose of test format evaluation and future exam development. While candidates may experience some uncertainty, it is essential to approach all questions seriously and manage time effectively to maximize performance on the scored questions.
Frequently Asked Questions
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How many questions are on the Step 2 CK exam?
There are 280 questions, of which 56 are experimental and do not count towards the final score. -
Can I identify experimental questions on the exam?
No, experimental questions are not identified as such. -
What is the purpose of experimental questions?
They are used to evaluate question formats and develop future exams. -
Should I spend more time on experimental questions?
No, prioritize the questions that will impact your score. -
How should I approach experimental questions?
Treat them seriously, manage time effectively, and make educated guesses if necessary. -
Will experimental questions affect my final score?
No, experimental questions do not count towards the final score. -
How can I prepare for experimental questions?
Prepare for all questions equally and practice time management strategies. -
Can I appeal my score if I feel an experimental question affected my performance?
No, experimental questions do not affect the final score and cannot be appealed.