iwtl how to become a polymath

I’ve always wanted to “learn everything I could” and recently I’ve learned the definition of “polymath” and thought it suited well for my desire. I am currently doing my 5th year of high school, and I want to spend my free time learning and studying in advance more advanced topics. my subjects would be for now: -Physics math chemistry and general science -history, philosophy and literature -everything that can be interesting really