No there is no section wise cutoff for JEE mains exam..you dont have to worry about sectional Cutoff the marks consider by IITs and NITs was just total of All three subjects.& also They will consider your 12th score Should be more then 75%.and For SC ST catergory it should be around 65%..Last year JEE mains cutoff was

General-74

OBC-45

SC-29

ST-24

PWD-(-35)

Candidate secure more then this marks will eligible for advance exam..

This year NTA will declare Score On April 30 2019.

Thanks