Hello,

Cotton university is present in Assam and it's government University. This is UGC approved college. If you want to change your degree then you have to apply the college to change the stream. No need to give any extra examination generally. If college authority said to you give some sudden test then you have to give it . I'll provide you a link below you can check it for more details about the college

https://www.careers360.com/university/cotton-college-state-university-guwahati

All the best.