Quick answer
Internationally trained doctors need Grade B (350) in each of the four OET sub-tests for GMC (UK), AHPRA (Australia), and ECFMG (USA) registration. From 2026, ECFMG requires all four Grade B passes in a single sitting; sequential pass-and-retake is no longer accepted. There is no Grade C+ Writing concession for doctors. Writing is the most retaken sub-test — typically due to Conciseness & Clarity losses from clinical narrative habits.