Is it academic IELTS and have you worked as an RN in and the NZ environment? Then most probable you will need a valid IELTS of 7 in one sitting for AHPRA. If it is they tend to still accept it, even though it may expire before your BP, however they now state when you finish the BP you have to satisfy the english requirements before you are registered as a nurse.
Study in english (unless for at least 5 years in english speaking country) does not exempt one from IELTS, working, in the role of an RN in one of the english speaking countries for at least 3 months however does.
You would be best to email AHPRA re this query.
Last edit by ceridwyn on Feb 3