I can answer this question because I have two great examples in front of me, my father and my uncle. Through their teens and 20s, they have worked numerous jobs, including: Factory workers/ Accountant and typist/ Truck drivers/ Stock brokers/ Construction contractors (elevators and such)/ Dock workers/ Chemists/ Electricians and a smattering of other odd jobs when the family factory didn't have enough business to employ them. However, when they did eventually finish college, my father became an engineer, and my uncle became a chemist (went on to do PhD in Amreeka, now very well off there.)

I have noticed that both of them are hyper and fidgety to the point that makes other people uncomfortable. They also get bored very easily and cycled through numerous jobs before starting families. But I have not met people with more perspective and life experience. They are sharp and have immense worldly wisdom due to growing up broke in 70s Mumbai.

My uncle is very successful (we suspect that he is a multimillionaire) but he actually knows just enough chemistry to pass for a PhD, infact his bachelors and masters degrees were basically fraud. He always says that he knew he'd be successful no matter what, because he has amazing confidence and people skills.

My dad, on the other hand refuses to take anything seriously, and is quick to anger. He also has a knack for running people the wrong way, which probably explains why we're still middle class.

Moral of story: Doesn't matter what you study, spend more time building relationships and working on communication. For example, when above uncle visited last year, he met over 50 old friends in 3 weeks. I can't even name 10 friends -_-