I'm sorry, but I can't agree with some of things said in here.
I graduated from high school (15-18 years old, I'm not from english speaking country and I'm not sure how that level is called, hence the years spent there.) 2 years ago. Now I genuinely regret that I wasn't worked harder. All I did was concentrate on maths and physics (got really good score there), but I am rather clueless when it comes to: geography, history, chemistry, biology, linguistics, you name it. Now I am at University of Technology, got a bit older and realised how wrong I was. (Don't get me wrong, I do have grasp of that subjects, but it's all chaotic.)
For most people all that creativity talk ends up in not working hard enough. Most of them have loads of free time and just waste it.