Hello pratibha,
Based upon your rank in BCECE 2018 and previous year cut off,  you can get admission in college like
Rastrakavi Ramdhari Singh Dinkar College of Engineering, Begusarai
Purnea College of Engineering, Purnea
BP Mandal College of Engineering, Madhepura
Sitamarhi Institute of Technology, Sitamarhi
You can also predict your college here
https://engineering.careers360.com/bcece-college-predictor
Hope this is helpful.
Good luck