According to the NCES, only ~14% of low SES kids complete a bachelor’s degree. The bachelor’s degree rate is low even among high achieving lower SES kids. Among the minority who did complete college, few low SES kids attended HYPS… selective colleges where a large portion of students go into investment banking and such. Instead if they attend college, it tends to be a local non-selective one. One example study is at https://www.nber.org/papers/w18586.pdf . The abstract begins
“We show that the vast majority of very high-achieving students who are low-income do not apply to any selective college or university. This is despite the fact that selective institutions would often cost them less, owing to generous financial aid, than the resource-poor two-year and non-selective four-year institutions to which they actually apply.”
Whether the minority of low SES kids who do complete college are more or less likely to pursue higher salary fields depends on choice of controls and how the question is framed.