Level 5 - Maths
This is a cool site to help you with all aspects of the maths curriculum. Scroll down to the year 9 and 10 tabs and click on 'see all skills'. You can choose your topic and work through quizzes to help you.
This is an Australian site but is relevant to New Zealand. Click on the years 10, 11 or 12 links to the left. You will then see more links down the left to explore a variety of mathematical strands at Level 5.