Quick answer
For internationally trained podiatrists, Grade B (350) in each of the four OET sub-tests is accepted for HCPC (UK) and AHPRA (Australia) registration. AHPRA's minimum for Writing is Grade C+ (300); Listening, Reading and Speaking stay at Grade B. The Writing sub-test tests your ability to refer diabetic foot, vascular, and biomechanical cases to a non-podiatrist addressee — usually a GP, vascular surgeon, or orthopaedic team. Most marks are lost on Genre & Style: podiatric terminology used without context.