What is the eligibility criteria for USMLE?

The eligibility requirements for examination differ depending on whether the applicant is a medical school student or a medical school graduate.
Medical School Students 
To be eligible for Step 1, Step 2 Clinical Knowledge (CK), and Step 2 Clinical Skills (CS), a student must be officially enrolled in a medical school located outside the United States and Canada that is listed in the World Directory of Medical Schools (World Directory) as meeting eligibility requirements for its students and graduates to apply to ECFMG for ECFMG Certification and examination, both at the time that he/she applies for examination and on his/her test day.

Medical School Graduates 
To be eligible for Step 1, Step 2 CK, and Step 2 CS, a medical school graduate must have graduated from a medical school located outside the United States and Canada that is listed in the World Directory as meeting eligibility requirements for its students and graduates to apply to ECFMG for ECFMG Certification and examination. The applicant’s graduation year must be included in the “Graduation Years” listed in the ECFMG note on the Sponsor Notes tab of the medical school’s World Directory listing. Additionally, he/she must have been awarded credit for at least four credit years (academic years for which credit has been given toward completion of the medical curriculum) by a medical school that is listed in the World Directory as meeting ECFMG eligibility requirements.