Hello Unhinged
Check out AC 61-18 Rev 5 on the CAA web site
On page 35 there is a section called Non-compulsory flight excercises.
You will find the information there (spinning, aerobatics and night, non-compulsory for C or B cats. Compulsory for A cats.)
In NZ for the issue of an A cat you do three flight tests with the associated briefings; standard manoeuvers, spinning and aerobatics, and night flying.
I hope this helps.