I am a S.C student i want to know that how many min marks are needed for iit delhi and kanpur in mechanical branch

The cut off for IIT JEE is decided on the basis of number of seats and the performance of the students. 

Individual subject cutoffs have been determined on the basis that top 80% candidates qualify in each subject.

·        There is some relaxation in the subject-wise cut offs available to reserved category candidates. The relaxation given in the subject wise cutoff to the reserved categories in respect of the General category are as under:

  The average of the marks scored by all such candidates is computed for each of the three subjects . Candidates meeting the cut off requirements for all the three subjects will be considered for the ranking.