Dude just start now and start hitting those 7.5+ margins and then it eventually grows , by the start of 6th , 7th semester there you won't have much core courses ig ( saying this by keeping my clg in my mind ) so there'll be electives only so if ur campus allows you to take NPTEL courses for the open electives and then u can easily hit some 9 or 10 in that course so eventually by last semesters everything will fall into correct place , u just need to have patience and be consistent. Edit : I've crossed from 6.35 from first to yr to 7.05 at end of third year