Well, the GMAT is only one portion of the application. According to US News, last year the average GMAT score at SJSU for the part time program was 561. So I think your score should be more than acceptable at SJSU.
Fall 2007 Admissions Statistics* Number of applicants (part-time) 280
Number of acceptances (part-time) 140
2007 Acceptance rate (part-time) 50 %
Fall 2007 Enrollment* Total first-year enrollment (part-time) 79
Average age (part-time) 30
Average undergraduate GPA (part-time) 3.26
Part-time student GPA range (10th-90th percentile) 2.82-3.94
New entrants providing their undergraduate GPAs (part-time) 72
Average GMAT (part-time) 561
Part-time student GMAT range (10th-90th percentile) 490-644
*Source: U.S. News & World Report