I am an adult undergraduate, can I apply for postgraduate studies in New Zealand or Australia?

With 5 points, you can apply to study language. However, after you go out, even if you pass IELTS, it will be more difficult for you to get admitted to graduate school. Because if the major span is too large, the school will not admit you to a graduate degree in this major. If the major span is not very large, the school will generally offer a one-year graduate diploma, which is equivalent to a bridge course for changing majors to graduate school.

If you pass, you can go to graduate school!