Hello,
Allotment of seats under category-b cannot be predicted.It totally depends on the students applying for seats under category-b. If there are not many students applying for seats under categort-b, then there are more chances for you to get a seat, in the other case you may not have good chances. If we provide you with some statistics and say you may/maynot get a seat, there are good chances for us to be wrong. Hope you can understand. Hope for the best.
Good Luck!