Hello aspirant,

Yes you can do it but I think there will not be more scope in graphic designing as compare to m.sc from maths, you can have good future in M.sc stream with maths Also. As graphic designing will come under computer applications. Learning such a course on a bachelor basis won't be that good because you should have your basics first. And computer applications or computer science would have been better than maths but since you are studying maths, just keep learning the basis of computer applications on the side and then opt for graphic designing in masters.

I hope my answer helps.