OET requires Doctors and Nurses to have a at least a Grade B on all four subtests: Listening, Reading, Writing and Speaking. So, you must secure a Grade B or A on all 4 OET subtests. However, the UK’s Nursing and Midwifery Council (NMC) now accepts a Grade C+ in Writing alongside a minimum B grade in the OET Listening, Reading and Speaking sub-tests. So, for nurses there a small concession that’s been made.