heres a story of my frnd...! he also had same kind of scenario!... he was gud in academics...! and he qualified jee-09 wid air 1800 got chem in kharagpur..
first, he carefully planned wat all classes to miss.....though he got 9.18 n 8.66 gpa in the fist two sems..!
secondly, hew didnot participate in amy of the co-curricular events in college..devoted entirely to jee
thirdly, i think its very difficult to deal engineering graphics...! its takes a lot of time to do..! main thing is to manage ur time!
he paid attention to his sheets to be submitted but he did well in the xam!!
lastly, go home during the fests...since u live in chennai...u ve an advantage...u ve festember in sep and pragyan sumtime in feb i guess... go home!
plan ur classes...! bunk useless classes like chem...since it requires only rote learning...keep ur attendance exactly 75%...dont lose hope...!!!