Dear Ankit Raul,

As of my knowledge B.Sc. (Hons.) in Mathematics involve following subjects in the respective semesters :-

Sem-I

Calculus,Co-ordinate Geometry,Algebra-I

Sem-II

Mechanics-I

Differential equations-I,Algebra-II

Sem-III

Mechanics-II,Differential equations-II,Analysis-I

Sem-IV

Vector analysis,Differential equations-III,Analysis-II

Sem-V

Numerical methods,Numerical method practical using C,Algebra-III,Analysis-III

Sem-VI

Probability theory,Linear programming & optimisation,Algebra-IV,Analysis-IV

above listing is just a course name as per semester wise , it may change from university to university. For better & details of subjects you may search directly university sites like JNU, DU, VITU, BHU etc. 

Hope you got your answer.

Good luck :)