See the admission process is totally dependent on the cutoff,that changes every year.The cutoff can be announced only after the final annoucement of the results by NTA, i.e.after April,2019.To know more about the cutoff,pl plea check the following link:-

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-cutoff/amp

You can get a rough idea about the cutoff from the previous years cut-offs.