i am from Delhi technological university,polymer and chemical tech branch. 10th result-10 CGPA(there was no percentage system during our time) 12th result-94.2% i am currently in my second year of college. I want to start preparing for CAT. how should i go about initiating my preparation? and is it a good decision to start this early? is it necessary to indulge in some form of extracurricular activities?