SAAT stands for Siksha-O-Anusandhan University Admission Test. As in the case of most universities, the cut-off of this exam is set by the governing body Siksha-O- Anusandhan University. Still a large number of factors determine the cutoff which include the number of test takers of that year, the level of difficulty of exam, number of seats available, number of students applying for those seats, and even reservation guidelines in some cases. So the cutoffs are different for every year. Yes previous cutoffs give a pretty much good idea but it is not good to rely totally on them. Best will be to wait for the results.
Good luck!