BITS Pilani is nearly impossible to beat at any score lower than 305.
Unless you are in an "IIT," or unless you are only concerned with the college brand name, the subjects you will study in the future. To be honest, your skills and knowledge will get you everything, but stream allows you to become eligible to sit for the jobs you want. You should emphasize focusing on the stream rather than the college brand name because many colleges have eligibility criteria, i.e. CSE/IT students can apply but others cannot, and thus other students are not exposed to enough opportunities, as is the case at the college where I did my undergrad and many other colleges.
The cutoff is very hard to predict and sometimes as it mostly ends up exactly the opposite of the prediction.
There are several reasons for a drop in the cutoff and the cut-off is considered as a relative thing. Factors that affect the cutoff are: -
The cutoffs are always relative and there is nothing an individual can do to affect the cutoff so it is better to focus on the studies and give your best shot.