Hello Aspirant,
The cut offs are as follows
General Category (GEN) 50% (600)
Reserved Category (OBC, SC & ST) 40% (480)
General Category PH 45% (540)
Reserved Category -PH 40% (480)
PCB group wise
General 489
Scheduled Tribe (ST) 361
Scheduled Caste (SC) 352
Extremely Backward Caste (EBC) 449
Backward Caste (BC) 472
Reserved Category Girls (RCG) 464
Disabled Quota (DQ) 270
Hope this will help you.
Link for further analysis
https://engineering.careers360.com/articles/bihar-ugeac
Good luck!
Thank you.