We don’t just create our own curriculum, we also create our own materials. Our original resources can be found here!
Online courses currently available at https://drmichaelsunmathschool.learnworlds.com/
Older Udemy courses will no longer be maintained, though there are some classics there.
There is also a book available covering HSC 2u, Ext1 and Ext 2 at an Ext 2 level.
The Maths Olympiad book series cover Junior-Intermediate, Intermediate-Senior and Senior-Pro