Irrelevant?

I recently read a blog post that left me with the question, "If I do good in school, will I suceed in my future career?" The author stated how he knows many people that did terrible in school but have been very successful in their career. So is all my hardwork at school completely irrelevant to what I will be doing six or seven years from now? Will all these late nights and red bulls be meaningless? Maybe I will get into a good college, but what does that leave me other than more education-based skills and strategies? Just some more Twizzlies tinkering...

Here's the article http://www.transleadership.net/?p=636