I have a interest in History,Maths and Science but I am unable to decide that what career would be best for me... Please suggest some suitable options

History isn't going to be the more lucrative area to pursue... but math and science fields are. Which of the two are you best at? And how far are you willing or able to go in advanced education.

I am best at maths

If your natural abilities are best in math and you enjoy it... then I would pursue that over all others.

DO you plan to attend college? If so how far? Bachelors degree, Masters? Doctorate?

I ask that because your final education level plays a factor in what options you may have.

I would like study till Masters

Are you in high school or university?

I am in high school

University if very different from high school. I would suggest that you study something in the sciences, while taking some math and history courses on the side as well. A science degree would keep the most options open, all the while you can enjoy taking courses about other subjects that you are interested in.