I had the "curse of the gifted" throughout high school and am suffering the consequences now (although I'm trying to turn things around). That said, I also had a friend who was an absolute monster. He operated on an entirely higher level of thinking than mine. Slept through class and just had to skim the textbook once to 'get it'. He would finish tests in half the provided time and get perfect marks. I ended up sitting next to him through Chemistry and Physics; we would goof off in class, and then go home and play games much longer than we should have. Then, a test would roll along, and he would get his usual 100 while I would do much, much worse. The way in which he just 'got' things was the source of a lot of malevolence and envy back then, although I've learned from it now.