"These trends may help explain why private school students are disproportionately represented in Ph.D. study in science and engineering and why they tend to dom

"These trends may help explain why private school students are disproportionately represented in Ph.D. study in science and engineering and why they tend to dominate admission into the most prestigious professional schools." This part here is malarkey. They're quoting it mainly to show why the topic is noteworthy, but the premise is faulty. Admissions boards are well aware of grade inflation and do not choose students based on ranking their raw GPAs.