Hello student I'm sorry to inform you but no you can't get admission in BALLB course without appearing in the entrance examination BHU UET.
As admission in BALLB course is on the basis of marks obtained in UET entrance examination.
Eligibility - Candidates must passed or appearing class 12 with in any stream with minimum 50 percent marks from a recognized board.
For more updates refer to the link mentioned below - https://www.bhu.ac.in/law/ba-llb.html
Feel free to comment if you have any doubt