Shelby: I've come to collect a parcel 12.5 mg seroquel for sleep Dean says about 75 percent of its associate's degree students persist to a degree at Dean or after transferring; the rate is slightly lower for bachelor's students. Landmark says roughly 80 percent persist to graduation there or elsewhere. Such figures are better than the national averages for all students. Experts say students with disabilities often take substantially longer than the traditional 4-year target, but they are remarkably persistent.