the first thing that you have to consider is your passion. ask your self first, what do i want to be? what is my aspiration in life? if i were to choose a profession, where will i be happy and where will i be satisfied?  the motivation is one the best keys to successfully finish any kind of major.  if you are not sure of the path that you are taking, you'll definitely get lost at the end of the day. how can you give your best if you lack interest on your major?
mmm.. maybe assess yourself too.know your fortes. what are the skills and the talents that you've got? it will make learning easier. since  you can relate your past experiences and stock knowledge to what you are studying. not just that, it could also make the learning process lighter and much  more interesting. you are learning and at the same time, you are having fun.