Ankit, it is a good idea to solve the model papers to get an idea of the question pattern, given that 12th board exams start in a few days.

You can find the model papers of Arts subjects on the official website of BSEB. There are around 10 sets of papers for each subject. You can find them on the given link: http://biharboardonline.bihar.gov.in/model-question-papers-ss

Also, you can find more model papers for board exams 2020 on the given website: https://school.careers360.com/articles/bihar-board-12th-model-paper/amp It covers subjects like Economics, History, Geography, Home science, Psychology, Sociology, etc. All the best.