Hii Prince 

Let me clear you one thing that there is not any type of passing marks in BITSAT as far as from branch point of view yaah...if your marks are 350+ out of 450 then only there will be some chances for you to take admission in any branch across any campus of Bits. 

From your 12th percentage points of view you have less than 75% overall but if you have an aggregate of 75% percentage in your PCM only then you can be eligible to think about admission in BITS otherwise no use.

Don't worry you have many private as well government college which will be under your domain. So just focus on that colleges

Good luck