First of all, you should determine what you want to do while you are still in your college. Take those courses that you think are relevant to your dream career.
During your academics, try in increase interaction with your teachers who have better experiences in life and also have better contact outside the institute that could earn you what you want.
You should also find an internship before completing your degree. It will give you practical experience and there is also a chance that you get a full time job in the same organisation where you have done your internship.
Try to meet professional people who are working in the field that you want to follow. Talk to them whenever you find a chance as it will help you learn many things that you cannot find in books.
Never forget to read the job section of different newspapers on regular basis. Apply if there is any vacancy available in any organisation that matches to your dream career.
Always remain optimistic and never think about giving up the idea of following the career of your passion. You should always remain consistent in your efforts which will ultimately bring you what you want.
You should always remain passionate about your dream career and try to develop your personal skills that could help you in grabbing the first opportunity if you find any along the way.