Hello Navv ender

I hope you are doing good . I am very sorry to tell you that it is not possible to change your course  from bsc to bsc hons ,authorities will never allow for it . In streams like maths ,chemistry,physics their are hardly any vacant seats available and if by any chance they migrate you then at your place seat will vacant so their will be the loss of fees and reputation of batch. Morever in bsc hons from first year large part of core mathematics is covered whereas bsc in first year some part of all subjects is taught

Hope you found this answer helpful. Good luck for your future