I am in class 11, and wish to do graphics designing. i have no idea about the basics, so Arena or Maac? and which course should i take?

Well you'd have to be quite talented to do it early and there must be a specific aim attached to it. if yes then go ahead. If you're creative, you can always consider going for Graphic Design and Animation. A good mentor and wise selection of courses with a good school, followed by diligent learning