Hello Aspirant,

See BSEB is a board, Bihar School Examination Board and to qualify for JEE Mains, there is no minimum aggregate percentage criteria but yes if you want to take admission into NITs, IIITs or CFTIs then you should score a minimum aggregate of 75% in your class 12th if you belongs to General/Unreserved category and 65% if you belongs to any of the reserved category from any recognized central/state board.

Also note that securing the aggregate of minimum 75% marks in boards does not ensure your admission to any of the IIITs/NITs/IIITs, in order to get admission in any of the NITs/IIITs you have to appear for JEE-Main and in JEE-Main you should secure good rank to get into it and for getting into IITs you need to firstly qualify JEE-Main and then appear for JEE-Advance and qualify it with good rank.

I hope this information helps you.

Good Luck!!