Hello,
Yes, you can change the subject but it is subjected to rules and regulations.The subject change is allowed only during the notified period by the University every year.You cannot change your subject once the examination notification is out. and the examination is complete.And change in subject is subjected to contact-cum-counselling provision at the study center or infrastructure facilities.
For other detailed information you can click the link below
https://braou.ac.in/wp-content/files_mf/1566796446UG1styr2019.pdf
Go through page number 39 in the above PDF.
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