I had just done the middle school physics course planning on doing the high school one next. When I was in the section where you add new lessons, I noticed in the bottom right corner of the science section, "Physics Library." I watched the first lesson, Sal teaches the history of physics, and when I read the article, I realized I had to learn many things before it. Of course, I anticipated this, but in every subject, I look at, I need to go and understand more topics to succeed in the next. For the lead-up to the Physics library, what math courses should I take? There are loads of them. I am in Year 9, so we haven't learned trigonometry yet, so that is my current topic. I don't yet know what my aspiration is, but I love the STEM subjects ever since we learned them in Primary School. I intend on doing the engineering course, but I need Physics first; to do Physics, I require math. It will take a long time to complete them, but it will be worth it. I know quite a bit of Algebra; and quite a bit of Geometry.