Hello,
Yes dear you can go abroad after completing your BSC in mathematics. BSC in mathematics is three years degree course. So after completing you can go for masters in mathematics. There are so many options for higher study in abroad like
There are lots of scope for higher study in out of your country.
But for this course admission you have to give the entrance examination, and so many examination for your language because english skills is matter. You can give the TOEFL examination, IELTS examination for entrance universities. Apply for student visa. After all of these things you can join abroad University for masters degree.
All the best.
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