Generally, the cutoff for JEE MAINS means that, the minimum marks needed by a candidate to seem for the JEE Advanced test.
The cutoff varies each year.
With you, over 13 lakh students seem out of that only 1.5 lakh students are eligible to sit down for the advanced test.
So, the marks scored by the 1.5th lakh guy, is that the JEE mains cutoff.
As the JEE mains could be a relative test, to clear the test, you've got to be within the prime 1.5 lakh students.
Then, there's class cutoff.
Like, if you are an SC/ST/OBC, you've got reservation, therefore the cutoffs disagree for them.
But, in the end, only 1.5 lakh guys square measure eligible for ADVANCED.
The rank of JEE mains through that you get admission in NIT's, or government funded schools, could be a totally different method, which incorporates the several board centile additionally.