Hello Keshav !

B.Sc Hons in Mathematics have 5 Semesters in total , the semesters have the following subjects ,

1. Calculus
2. Mechanics I
3. Geometry
4. Differential Equations I
5. Algebra I
6. Algebra II
7. Mechanics II
8. Vector Analysis
9. Differential Equations II
10. Differential Equations III
11. Analysis I
12. Analysis II
13. Numerical Methods
14. Probability Theory
15. Numerical Methods Practical using C
16. Linear Programming and Optimization
17. Algebra III
18. Algebra IV
19. Analysis III
20. Analysis IV

Hope it helps !