Admission - JEE Main Score or Rank?

Its mentioned in the iMTech admissions page that the date of notification of selected candidates is June 4. JEE Main AIR will be declared a month later(July 5). So, is the admission based on score or rank or both?

And another thing...
Since there's a new course(ECE) this year, will the cut-off for CSE get higher?...Probably 17-18k?