Hello Aspirant,
Best way to score good is just prepare notes from your school suggested books.It will help a lot.Here is the link from where you can download model of any subjects of class 12th .
https://school.careers360.com/articles/bihar-board-12th-model-paper
https://boardmodelpaper.com/bihar-question-paper-for-12th-class-bseb-intermediate-important-question/
Hope it helps
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