Well, the answer is, of course, everything. Nah! Just kidding. :)
I know that I write better than most people my age due to the fact that I practice daily (I try to write at least a sentence, but my goal is usually to write at least a few pages.) I read incredibly fast, much faster than anyone I know, and still have comprehension. I read Harry Potter and the Deathly Hallows in about four hours (I don't normally time myself when I read. In fact, I think this is the only instance. I'm sure I had a specific reason for it, but I can't remember)
I learn faster than most people. That's a blessing in some ways, but mostly a curse. Also, this isn't something to brag about, but if for some reason I forget something I've learned for, say a test, I'm very good at BSing my way through it. I think this is because I have learned so much over the years (not only do I read fast, but I read a lot, which is probably why I read fast) that I can connect it all together and make sense.
Of course, this doesn't work in all cases because some teachers are very vigilant. Also, I don't encourage myself to BS through tests. I prefer studying.