The comments above are pretty spot on in terms of preparation for a career in investments or brokerage. Degrees in finance, economics, business & finance are all good starting points. While in school you should really make sure to investigate analytics - to study data and how to identify trends. Make sure to learn some programming languages in this area too. SAS, SQL, R - these are statistical and analysis languages that will be advantageous and help set you apart from others.
The next step would be to identify schools that require internships - real world experience while in school is key.
My suggestion: do some research. Identify companies in investments, brokerages, etc. and their top staff. Research them on LinkedIn and see where they went to school.
Hope this helps.