Dear Student,

You can not enter into lateral entry into bsc course it is possible only in btech course.However,you can do two undergraduate degree depending upon your interest.You have to study for 3 years if you now want to pursue bsc hons in mathematics.

Thanks

If your university allows lateral entry then obviously you can do that. But in general no such lateral entries occur in cases like this. But if you want to study maths hons then you can enroll yourself in the BSc(Hons) in Mathematics as a regular student starting again from 1st year. This is possible but I don't think there is any such lateral entries.

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