You are required to take the USMLE exams to gain ECFMG certification and eventually Board Certification in the US.
ECFMG (Educational Commission for Foreign Medical Graduates) Certification is required for all International Medical Graduates who wish to work or train in the US and to gain this you'll need to take and pass the USMLE Step 1, Step 2CK and Step 2CS exams.
To gain State Licensure, you'll need to take the USMLE Step 3, which is typically taken by US Medical Graduates after their first year of Residency.
To gain Board Certification, enabling you to work in any US state, in any job, you will need to complete a Residency Training Program.
Step 2 CK
Step 2 CS
Basic Sciences Mechanisms of Health & Disease
Clinical Sciences Application to patient care
Clinical Skills Communication, Spoken English Proficiency, Patient Interaction