While I do agree that learning from your mistakes is a huge part of education, I think your interests are a close second. Generally, I'm intrigued by something that others deem to be difficult. I scored better grades in all of my engineering, math and science classes than my intro courses like psychology, economics and so on which I attribute to being more interested in science and thus being able to focus more.
For example, I was always very intrigued by calculus because most people talk of how difficult it is. I wanted to know why it's so difficult, so the first opportunity I had I took a calculus course. The subject itself wasn't necessarily interesting, I wanted to know what the fuss was about.
For example, I was always very intrigued by calculus because most people talk of how difficult it is. I wanted to know why it's so difficult, so the first opportunity I had I took a calculus course. The subject itself wasn't necessarily interesting, I wanted to know what the fuss was about.