Guy Kawasaki has a wonderful post 'Ten Things to Learn This School Year' (actually 12 things) explains the most important things that one must learn at school.
They are some of the most valuable things, one must learn to succeed in the real world. For an aspiring entrepreneur, they are MUST learn things. Unfortunately, none of them are taught at school. One must make explicit and deligent efforts to learn them on thier own.
One more important aspect, and the most valuable asset in real life (I guess Guy missed) is 'experimentation' and 'application' of what you learn. Schools teach you to study, review, analyse and present. But never explicitly make you to apply what you learn, experiment and try out. This is quite a serious issue with educational institutions in India, right from a rural high school to IITs.
And most schools teach you to 'conform' to rules of the game. Do what I say kinda conventions, Never allowing or encouraging original, new and/or radical thoughts. So one must also learn to be their ownself without worrying about compliance to norms. What about creating your own norms for that matter? This is another issue in India, where social peer pressure is so immense that many are frightened to stand out.
That reminds me of a great movie, 'The Dead Poets Society'.
I brought them up here to illustrate the point of conformity: the difficulty in maintaining your own beliefs in the face of others. Now, those of you -- I see the look in your eyes like, "I would've walked differently." Well, ask yourselves why you were clapping. Now, we all have a great need for acceptance. But you must trust that your beliefs are unique, your own, even though others may think them odd or unpopular, even though the herd may go, "That's baaaaad." Robert Frost said, "Two roads diverged in a wood and I, I took the one less traveled by, and that has made all the difference." Now, I want you to find your own walk right now. Your own way of striding, pacing. Any direction. Anything you want. Whether it's proud, whether it's silly, anything. Gentlemen, the courtyard is yours. [Source of the Movie Script]