ICSE Class 10 Answered
Hi Aarya,
Yes, you can switch to History and other arts field after completing 12th in science. The utmost important thing is that you should be really interested in that subject so that you are able to excel in it.
Giving a link below, please listen to first few minutes which will give you various career options after you pursue bachelors and Masters in history and Political Science . After clicking on the link, please choose "tips for History" and "tips for Political Science" under the heading "Class Information". A video will appear in which for first few minutes you will be briefed about career opportunities after you choose Arts after 12th grade.
http://www.topperlearning.com/study/cbse/class-12-humanities/b101c505