should i do B.Ed or M.Sc(math)or M.Sc(computer science) or M.Sc(Bio-informatics)
Do whichever one you love most. :)
To add: Did you by chance take any classes or read into any of these fields? Try to narrow it down to something you're torn with and maybe we could help you in our point of view. It is ultimately your decision but you certainly should go by the first statement in this post.