After Bsc honours in Mathematics,You can opt for Msc in mathematics and many specific subjects are provided for Msc such as
MSc Mathematics.

MScAlgebraandNumber Theory.

MSc Applied Mathematics.

MSc Applied Statistics.

MSc Computational Mathematics and Cybernetics.

MSc Cryptography.

MSc General Mathematics.
Hope this helps you.

Hi 

There are several field in one can master. 

Their is Msc in physics

Msc in particle physics

Msc in atomic physics

Msc in quantum mechanics

Msc in organic chemistry

Msc in mathematics

Msc in mathematics finance