Hi Sidhant :) The eligibility criteria is just passing the 12th boards for pursuing Graphic designing in most of the colleges in India so you need not worry about the percentage. The best colleges which you can consider taking admission in are- National Institute of Design (Ahmedabad), Pearl Academy, NIFT (Delhi), IDC (IIT Bombay), MIT Institute of Design(Pune), Srishti School of Art Design and Technology, Indian School of Design and Innovation (Mumbai), Banaras Hindu University, Delhi College of Art, Department of Design (IIT Guwahati).