What are some things i will learn in math in ninth grade?

-And do you know any websites I can go on to help prepare me for the math? Also, I learned some ninth grade math topics last school year towards the end of the year, but will my new math teacher go over the material as a refresher?In my opinion, grade 9 math was really easy. Some of our topics included: linear relationships, slope, angle relationships, variables and equations, area, surface area, and perimeter of 2D and 3D shapes, integers (review), number sets, powers and exponents, and polynomials.