I had trouble in high school. I fell behind because I did not have glasses, and I didn't find the material motivating enough, and because things were kind of tumultuous at home, and so on. By the time my dad caught on, I was 3 months behind in Physics.

So he sat me down after work, and we went through the material together. It took less than a week for me to catch up.

It makes me wonder what a kid could accomplish with a little bit of individual attention. I am not the dumbest person in the world, but I am also far from the smartest. Compared to the rest of the class, I was probably about average.