Hello Aspirant ,

You can pursue 12th board from any Board based upon your interest whether it is CBSE Board or BSEB Board. CBSE Board schools has same syllabus throughout India whereas BSEB Board schools syllabus is confined only to Bihar State. But  I suggest you to choose CBSE Board for pursuing your 12th board  because most of the all India entrance examination question papers are set by considering CBSE Board syllabus, CBSE ensures that its syllabus covers all the topics required for study and ensures a better understanding in the student. so, it is best to opt for CBSE Board for pursuing your 12th board .

Hope It Helps

All The Best !!