Quick answer
Internationally trained doctors need Grade B (350) in each of the four OET sub-tests for GMC (UK) 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. The GMC has no Grade C+ Writing concession. AHPRA (Australia) does: it has accepted Grade C+ (300) in Writing since 18 March 2025, with Grade B in Listening, Reading and Speaking. Writing is the most retaken sub-test — typically due to Conciseness & Clarity losses from clinical narrative habits.