Hello Ankit,

The Bihar Board or BSEB model question papers are available on our very own website. Not only physics, but you can download any other subject papers if you wish to. They are surely going to help you get the paper pattern and how to go about. I'll attach a link below. You can download the model question paper of your choice/subjects.

https://school.careers360.com/articles/bihar-board-12th-model-paper

Just scroll down and then you will find columns with different links to download the papers.