Hello aspirant this year the qualifying cutoff of jee mains which is released by NTA for OBC NCL category is 74.3166557 . To clear the jee mains you must have to fulfill the 2 criteria which is 

• To secure minimum 75 percent marks in you 12 board exam ( GENERAL AND OBC).
• To qualify the cutoff releases by NTA.

For more information visit this link 

https://www.google.com/amp/s/engineering.careers360.com/articles/new-eligibility-criteria-for-nits-and-iiits-admission-says-mhrd/amp