I have this hot girl in my class, just be the cool-underdog (or if you're not an underdog just be cool) who gets As+Bs, who dresses nicely and opens doors for the girl,be friendly to her over most people.
It's a plan that almost always works, i think she likes me back. :D
Oh and never get into fist fights unless they're self defence.
Also, girls DO NOT like people who pick-on or bully others.
But i don't think 4th graders should be dating though.