Dear Manorama,

You can choose MECH. OR ARCHitecture but beside loving maths you should have some interest in Physics also.

And If you are really interested in MATHS and would like to play with it and earn a name the best way is to sit for the enterance examination for the INDIAN STATISTICAL INSTITUTE, loveingly known as ISI, it is is at Kolkata, BT road. The passout from this institute makes there way into various orgainsation in Indian govenment. the alumi are also liked at various instiute at UK and USA.

I think it's helpful for you.

Best wishes.

You can go with any branch.
During the engineering time you will learn core subjects.
You can develope any skills in that duration
But if you want suggestions on basis till now
I will prefer
Computer science
Civil engineering
Mechanical
Chemical
Metallurgical
Good luck.