Somebody who has quit school/uni for amateur game developing/developing his own game?

But you need investment, you will need other employees I guess. Are will you focus on being a one man army? Making a game is not only about art, sound, design and programming, you have to manage a project too. So my personal experience and advice would be: do not quit, rather do your best in your studies and put all your power in doing as much as you can.