... Witteveen said he believes the advantages of wealthier families pay off in job searches of their offspring. "Their parents are better connected, they may set their children up in cities with jobs. They may be people like those doing the hiring. These are all circumstantial class-related resources," he said. The paper refers to these advantages as "parental bridging." Colleges may not be by themselves able to provide similar advantages to their graduates from low-income families.
So, you may not be "smart." It may just be that your family was affluent and well-connected. They need to follow this up with comparison studies, to see how these same students did when out of the range of parental influence (making choices on their own).