Do you ever wonder?
What makes that popular kid a genius? Have full marks, answering cleverly and is confident all the time. I had three of them in my high school years, they excel both in academic and sports. Enjoys a lot, seeing them win for our school!

Genes, family of scholars or professors.
Hard work, tons of training and revision.
High IQ, absorbing knowledge fast.

But to me, it's important to have fun while learning :)