The expected cut-off for JEE Main 2017 for General Category is 100. And for OBC-NCL, Scheduled Caste and Scheduled Tribes, the expected Cut-off are 70, 52 and 48 resp.
Besides, there are two major changes for JEE 2017:-
a) No weight-age for the 12th class marks in calculating the ranks in the JEE Main exam.
b) For the candidates to qualify for admission in the IITs/NITs/IIITs and such other CFTs whose admissions are based on the JEE ranks, they should have secured at least 75% marks in the 12th Class exam, or be in the top 20 percentile in the 12th class exam conducted by the respective Boards. For SC/ST students the qualifying mark would be 65% in the 12th class exam.
Biggest change done for JEE 2017 is that marks in 12th exam will not be a deciding factor of determining the ranking in JEE Main 2017. However, it is compulsory to score at least 75% or be among the top 20 percentile in 12th class exam conducted by boards to appear in JEE. Apart from this, no major changes have been announced yet for JEE Mains.