Recently, I've been wondering, "What's the best way to learn mathematics?" since I've been struggling with some problems of my physics' homework. I know that taking notes and reviewing the material by using the Spaced Repetition Method is really important, but I'm looking for something else.

The first thing that came to my mind when I asked myself that question was interleaved practice. Interleaved practice involves mixing different kinds of problems, which helps you to identify not only how to solve a problem, but also when you should use certain strategies. So, let's suppose I need to review three completely different topics of mathematics. Rather than reviewing one topic at a time, mixing those topics and then reviewing them will be more difficult, but also more effective.

The second thing I considered as important when learning anything is flow. Learning mathematics should be something you do because you want (intrinsic motivation), not only because you must do it in order to get better grades (extrinsic motivation). Furthermore, the more you're aware of your current skills, the better. You should practice with problems that challenge your current skills at the limit so that you can enter the flow state. Hard challenges will make you feel anxious, but on the other hand, easy challenges creates boredom.