However, scholars, nurses, military officers, teachers, many kinds of employees of non-profits (e.g. university staff, hospital physicians and other staff, etc.) and social workers could be considered upwardly mobile (in both income and other ways) if they came from lower income families headed by parents in lower skill and education jobs.
Indeed, if you get away from the demographics of colleges focused on in these forums (where half of the students come from top 3% income families), such professions are probably upward mobility for a large percentage of college students.