Your percentage ie pretty much good,you can definetly get scholarship from CBSE.
But few condition's are their:
*You must have to join any course after you 10+2 class.i mean to say if you go for any coaching for b tech then you can't get these scholarship.
*You must have to join btech these year only.
Scolarship amount for above 90% students:Rs 81000
For first three year(after your 10+2 class) you get:Rs 1000 per month.
For next two years:Rs 2000 per month.
So,to get these amount you have to fill application form online provided on cbse website and make attested these copy with your college (where you going to do Btech) and send to the address of CBSE before 30 september 2011.
For more information visit CBSE website:
www.cbse.nic.in