Hello all! I'm just out of high school and have got a few months before college begins. I think I'm fairly good in high school math, and now I've just started self-learning Single Variable Calculus (Calc I) from MIT OCW Scholar. I love Physics, and aim to be a physicist someday. I recently obtained the Feynman Lectures from my town library, and really enjoyed Prof. Feynman's quirky, yet detailed way of explaining Physics. But as I glanced some of the later chapters, I found the math to be quite unfamiliar compared to what I've learnt so far. So I was wondering, upto what level of math do I need to be proficient in, to truly understand the Feynman Lectures? Thanks in advance!