Abhishek, with few days left for the Bihar Board examination, it is a good idea to solve the model papers to get an idea of the exam pattern, marking scheme and other important things. You can find the model papers for Bihar Board 2020 on the given link: https://school.careers360.com/articles/bihar-board-12th-model-paper/amp

You can also find many sets of the subject wise model papers on the official website of BSEB. The link for the website is: http://biharboardonline.bihar.gov.in/model-question-papers-ss