Hello Rakesh,

If you have completed your 12th in scientific stream then you cannot change your stream to arts. But if you want to pursue your career in a field related to arts then you opt for a course in Arts(eg. History Hons, Political Science Hons) in Delhi University. There will be no issue.

If you haven't completed your 12th then there's a chance to change your stream. You can contact your school authorities for that matter.