Answer:
According to the NZQA website, NCEA subjects are made up of achievement standards and unit standards. Achievement standards are graded with N (not achieved), A (achieved), M (merit), or E (excellence). Unit standards are usually assessed as either A for achieved (pass) or N for not achieved (not passed).
So, the difference between not achieved and not assessed in NCEA New Zealand is that not achieved means the student did not meet the criteria of the standard, while not assessed means the student did not attempt the assessment or did not submit enough evidence to be graded.
I hope this helps you understand NCEA better.
Step-by-step explanation: