I am NOT saying that the IIT admission process is easy, but I will say that this is the wrong way to show that the process is hard. Not all smart students vie to attend Harvard, MIT, and Stanford in quite the same way that many, many, many smart students vie to attend IIT. The base of applications is broader, by far, for IIT, partly because of the especially steep drop-off in quality and in prestige from the IIT echelon of universities in India to other universities. If we compared Harvard's number of admitted students in the most recent reported year, 2,029,
http://news.harvard.edu/gazette/story/2013/03/college-admits...
to the number of students who took the SAT college entrance test in the relevant high school graduation class, 1,664,479 students,
http://media.collegeboard.com/digitalServices/pdf/research/T...
we could calculate that 0.12 percent of all high school seniors in the United States who took a college entrance test were admitted to Harvard, quite a low base admission rate. The key, of course, is that many American students self-select out of applying to Harvard, and indeed don't self-select to submit an application to any "prestige" university.
That said, direct examination of the IIT examination item content
http://www.askiitians.com/iit-papers/iit-jee-papers.aspx
may suggest what level of performance on specific item content is necessary to be part of the small subset of the large number of IIT joint entrance examination test-takers who gain admission to an IIT campus. On that basis, I agree with the statement that the IIT undergraduate programs are highly selective and likely to collect on one campus many very smart young people who provide a good peer group to one another so that everyone on campus picks up habits of aiming high intellectually, as the IIT alumni I know here in Minnesota all seem to do.