The Correspondence School is providing online access to these resource files for NCEA 1,2 and 3 to help Christchurch students, this is open to everyone.  so you can download the workbooks while they are still on there.

Level 1:

http://www.correspondence.school.nz/subjects-and-courses/te-
kura-resources/ncea-level-1-resources
Level 2:

http://www.correspondence.school.nz/subjects-and-courses/te-
kura-resources/ncea-level-2-resources
Level 3

http://www.correspondence.school.nz/subjects-and-courses/te-
kura-resources/ncea-level-3-resources