If it is for engineering course, there is no special criteria for Bihar board. To be eligible you should have obtained a minimum of aggregate 75% marks in Physics, Chemistry and Mathematics subjects in Class 12. In addition, you must have obtained at least 60% marks in each of the Physics, Chemistry, and Mathematics / Biology subjects.
For admissions the minimum cutoff is 201 marks in BITSAT. Check BITSAT eligibility here https://engineering.careers360.com/articles/bitsat-eligibility-criteria
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