In the Bihar School Examination Board (BSEB), ‘NRB’ signifies ‘Non-Residential Bihar,’ referring to students outside Bihar appearing for BSEB exams. ‘MB’ stands for ‘Model Blueprint,’ providing model papers outlining question paper structures, mark distributions, and question types. The BSEB 10th model papers and BSEB 12th model papers aid students in comprehending exam patterns and preparing effectively.