Do you ever feel like you truly understand what's goin' on, you get why this equals that and why you need some of this to make some of the other? That's how I felt about Chemistry.
I felt like I was totally getting it. I understood the formulas, the conversion process, cations, anions, covalent bonds, everything. And then I took my first test.
I guess I don't know as much as I thought I did.