SAT And ACT and other standardized tests are the single best thing for giving poor students a leg up against rich students. We should be putting more emphasis on those tests. A poor but smart student can study for a test and do well on it, while they can not have continuous tutoring throughout school, paid grad students to do or proofread their homework, or extracurriculars that cost more than their parents pretax income.
Your business is selling an advantage to the rich students coupled with increasing student stress throughout school. Your "holistic" view can't account for "students grades are slipping because they were sleeping in their friends basement after their parent killed another parent" or "students grades are slipping because they are working 40 hours a week, illegally, at 14", but it will holistically show "student got a B+ so their dad who makes $500k a year hired a tutor for 10 hours a week".
Your business is selling an advantage to the rich students coupled with increasing student stress throughout school. Your "holistic" view can't account for "students grades are slipping because they were sleeping in their friends basement after their parent killed another parent" or "students grades are slipping because they are working 40 hours a week, illegally, at 14", but it will holistically show "student got a B+ so their dad who makes $500k a year hired a tutor for 10 hours a week".