I know these are extremely common suggestions, but… • 3Blue1Brown has great introductory series on linear algebra and calculus. • Khan Academy covers pretty m

I know these are extremely common suggestions, but… • 3Blue1Brown has great introductory series on linear algebra and calculus. • Khan Academy covers pretty much all of US high school mathematics, and you can go through it at whatever pace you want. • I can send you a few Australian high school textbooks if you want.