The cut off varies year and branch wise and the admissions are done on the basis of AIR and in previous year the closing rank for top branches like CS, ME, ECE, EE etc were -

BE Computer Science and Engineering - 15950

BE Mechanical Engineering - 62517

BE Electrical Engineering - 55826

BE Electronics & Communication Engineering - 69924 

Also, you can check your expected rank below -

https://engineering.careers360.com/jee-main-rank-predictor

Good Luck!!!