Is M.Sc. Is necessary for cvt after B.Sc.

If you want to go for Masters then yes it is compulsory.

Yes, you can pursue MBA after B.Sc. Eligibility for MBA in good reputed Universities is approximately 50% marks in your Bachelors degree + you may have to qualify some entrance test and an interview, depending upon the university you choose. You can pursue your MBA in different streams like Informat