Hi,

After doing B.Sc in Maths hons. paves way for plethora of opportunities for you.

1.You can go for teaching. For that you need to do B.ed or you can do your masters and apply for NET exam and become a lecturer.

2.You can go for banking jobs as it requires lot of calculative work. Also, you can prepare for various jobs in the government sector.

3.You can go for data analytics field job.

4. You can do MBA and join marketing industry. You'll need a good academic record for this along with clearing the CAT exam. 

5. Become a Tutor! You can start your private coaching classes as Maths is in huge demand. 

So you can choose whichever suits you the best.
Hope this helps, good luck!