You learn how to deal with teachers that threats you like shit(and think they are good) and you also build a lot of hate to anything academic related, which can prove to be good as you won't want to be a part of the system and will give you 1000 ideas, will make you a god in execution so you will have success for sure, to not be like them.

Oh, I forgot to tell you that they give you a diploma just in case you fail as an entrepreneur -- and you won't.

The rest I think you can learn by yourself.