School is a place to learn and hone your knowledge. You should know what your passion in the field. then you can hone your skills by signing the specialized field in college. so you can get more powerful skills after graduation. then you could work with your passion. I'm sure you would enjoy the job until you become rich?
If you wanted to become rich, having a job is not enough. Maybe you will be if you hold a very big position in a company and your salary is very big. I think the way for one to become rich is to have his own business and then control his finances. A business that he will be passionate at so that he will never feel that he is working but just enjoying. For a starter, one can have a job first that is ideally related to the business he wanted to put up to have an experience and know the ins and out of the business and then after some time having enough money and experience then he can put up his own. One can also trade whether it's forex, stock market or bitcoin trading. If he has the skills of a trader then he can become rich from it too.