There is no scholarship given on basis of score in bitsat .
But after you get admission in BITS you can get some sort of scholarship there.
1.MCN- This scholarship is for those whose parents income are less than 8 lacs per annum (number is changed every year ) .Scholarship on the basis of your CGPA .This scholarship is applicable for one semester.For next semester you have to score good CGPA in order to get scholarship.
2.Merit scholarship – This scholarship are for those who are top 5 to 10 students of the batch.Generally getting this scholarship is very hard.
3)Inspire scholarship – For this you have in top 1% of class 12 board or you should have jee advanced / mains rank under 10000.