That is quite a switch going from Business to Science. Do you know what aspect of Science you are interested in studying? There are so many different topics and majors you can study. My suggestion is to take a little time to research the area of Science you would like to study, check what the requirements are for that degree and compare those to the courses you have already taken.
Changing majors is done a lot by students and it is understandable as you think you are interested in one field and then as you take courses you find another area that interests you more. I think one of the most important things to remember is to be sure when you change our major that you are sure that is the direction you want to go because it can lengthen your college education. Whatever you decide, it is always good to do some initial research, look into what careers are available in your field of study, check to see if there may be a secondary area to your major and possibly take some of the courses in that area.
Good luck Madan and remember you can go in whatever direction you choose, just be sure to choose wisely and follow your desire.