Ask HN: How do you learn math and physics?

Honestly, this stuff is hard for me, so I'm wondering what HNs' experiences are? What learning/study tools are most useful? How do you train yourself to "think" in mathematical terms? My story, FWIW: I was the kid in high school that didn't pay attention in math class and just figured out the problems during the test. Instead of math and science classes, I took art classes and read philosophy books. In college (2nd year) I'm majoring in philosophy. Knowing the history and philosophy of mathematics and physics has sparked a renewed interest, and I'm now taking a college physics course (algebra-based, not calculus. I basically failed calc last year, probably due to my high school slacking). Sidenote: How can math/physics professors throw out terms like Euclidean geometry and Pythagorean theorem and Cartesian grid and not mention anything about their other contributions? I'll never understand how they can gloss over stuff like that...