BIT MESRA is a private deemed to be university. BIT offers multiple courses in Engineering and Science. Now as per the official website, there are no such information available regarding the switching of fields available. So nothing conclusive can be provided, but as per the information available online, you can't change the field like that. To be sure I would recommend you to contact the BIT MESRA contact details by visiting the link below:

https://www.bitmesra.ac.in/BITCampusDirectory_List?cid=1

To know more about the college visit the link below:

https://www.careers360.com/university/birla-institute-of-technology-mesra

I hope this answer helps. All the very best for your future endeavors!