Can I undertake 2 courses at the same time if one course is by correspondence?

Student visas are for full-time study. Read more here about studying by correspondence.

Study

May not meet study criteria

We issue student visas for full-time study in New Zealand.

You can undertake a second course of study, if you wish.

However, you could not use the correspondence (distance learning) course to make up the full-time criteria.