Hello student the registration is going on you need to register yourself before the last date on patna University website the link is mentioned below -

http://www.patnasciencecollege.org/admission.html

WWhen you open the link you'll see a pop up apply online for admission in Bsc (Maths/bio) just tap on it it'll redirect you to the patna University registration portal.

Eligibility - candidates must passed or appearing class 12 with physics chemistry and mathematics from a recognized board.

Feel free to comment if you have any doubt

Good luck