I think you mean the satellite campuses of BIT Mesra at Patna and Deghar respectively. You have to separately apply to each of the campuses by going to their websites and filling up the form. They usually consider JEE MAIN as well as Class 12th board performance and have quite low cut-off.
College Comparison based on Courses, Placement, Rank, Fee
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile