now i am 2year i want to get a best iit clg wat should i concentarte more

plz give hits

dear akash 
nothing to worry about . 
you have enough time in your hand as of now . so, start with besics and focus on all 3 subjects , donot ignore anything . 
frst ncert , then read the concept with 1 ref books , 
and then start with solved example , then attempt prev year ques paper of that chapter . 
this should be your preparation strategy . 
all the best 
kindly approve