<p>Many colleges allow retakes for classes in which a student got a C- or lower (non-transferrable grade). This might slow down her time to degree and cost more, but it may be helpful to get her out of a GPA hole. Is the 3.5 her overall GPA or just her semester GPA? Your D should check her school’s catalog policy on retakes. Grade changes for previously taken courses are generally not done a year out.</p>