IELTS study is not enough. Let's see what language classes are available in universities in New Zealand.

Auckland University of Technology (AUT): His language center is called International House. One of the courses offered is a general English course, which is mainly aimed at students with poor English level who need to make up from the foundation, so there is no admission requirement. The other course is the GIE Direct Course, which is a 12 week course. After completing the study, you only need to pass the internal exam, so you can avoid IELTS from entering the main course of AUT University. This course has IELTS requirements.

Massey University: Massey University Language Center. The courses are mainly general English and diploma courses: 16 weeks courses. Undergraduate and graduate students have different admission requirements. Language courses for graduate students are only offered twice in February and July. The minimum entry requirements are 5.0 (single item 5.0) and 5.5 (single item 5.5) for graduate students.

You didn't provide your grades, so it's not easy to find you. However, you can try the volunteer reference system for studying abroad, input your GPA into the system, and the system will automatically match the student cases similar to yours from the database to see which institutions and majors they have successfully applied for, so that you will have a direction. If there are few cases to be inquired, you can fill in a few less items, or inquire according to the "study abroad goal".