Hi, Based on another question you asked, and the "+2 student" reference, I am guessing that you are a student based in India. Here is a website focused on students in India, which may provide some information to help you in your decision making: http://www.studentindia.com/stud/index.jsp
I also found this website with information about careers and higher education in India: http://www.careers-india.com/
In the U.S., we have college guidance counselors at high schools and other organizations that can also help students decide what to study. If you have the same at your schools in India, that is another resource you might try to help you decide on a course of study.