Which course is best for me in future after completing 12 TH(maths).

Gaurav, If you're creative, you can always consider going for Design and Animation. This is a field where nobody cares for your qualification, they only see if you can do quality work. A good mentor and wise selection of courses with a good school, followed by diligent learning, would get you a head

You may opt for BCA ot take subjects of Humanities (Arts) like Literature, Mass comunication ETC.

After a +2 with Maths, you may proceed on to do a B Tech/BE. You will have to clear state/national level entrance examinations to get into good institutes. Other options include B Sc with Physics, Chemistry or Mathematics mains, BBA etc.

Gaurav, you have an option of apply for Dual Degree Global Program - International BE (Computer Science). Its a unique program in which you have to study for 3 yrs at Bharati Vidyapeeth-DITM, Pune and 4th year at Athlone Institute of Technology, Ireland. You will receive a BSc (It) and BE (Software