For High School Physics, I would recommend having some knowledge of concepts of Algebra 2 as there is a significant amount of Math used in the class. This doesn't mean you need to know Algebra 2 before you start the class, but I strongly recommend taking Algebra 2 alongside Physics next year. If you plan to go on and major in Physics in College, you should be taking as much Math as you can, as you will eventually have to take the entire Calc. sequence and differential equations.
