Can I drop out of school at 16?
In the US, depending on where you live and your family structure, you can drop out any time you like basically. I know there are rules but if you are older than about 12 - 13 and your parents don't care - aren't around, aren't paying attention, don't know what you are doing - I think you can pretty much get away with it. Our schools and courts have too many other things to worry about than to chase after you and try to make you go to school.
As others have said, I don't recommend it. If you don't know anyone who has dropped out of school and seen the repercussions, look around a little bit. Unless you are the 1 in a million genius with a brilliant idea to make money (legally), then you are dooming yourself to a long life of hardship.