This is a highly dilemmatic question for many candidates who did not get a good score in the first attempt. Few will think of dropping one year as a waste of time and that they will argue that in that year they could have completed one year of Bachelor course. Secondly, those taking coaching will think about the loss of a huge amount of money. If a candidate really wants to be in an IIT then dropping a year could be worth. Why? Candidates can prepare better and more effectively for the exam. Even the statistical analysis that comes out has said that JEE has been cracked more in number by those who were droppers or repeaters.