That myth comes from the test prep industry, which makes exaggerated claims about their importance. "Once scholars control for all these factors as best they c

That myth comes from the test prep industry, which makes exaggerated claims about their importance. "Once scholars control for all these factors as best they can, they find that coaching has a positive but small effect: Perhaps 10 or 20 points in total on the SAT, mostly on the math section, according to careful work by Derek Briggs of the University of Colorado Boulder and Ben Domingue of Stanford University. ...a 20-point improvement to a score in this range would have no practical meaning for students who are trying to get into more selective schools. Even when it comes to less selective schools, just 20 percent of the counselors said a boost from 430 to 450 would make a difference. In other words, research has debunked the myth that pricey test prep gives a major bump to students’ scores, but it’s also hinted that whatever modest bumps they do provide are more likely to help the people who are already at the top." https://slate.com/technology/2019/04/sat-prep-courses-do-they-work-bias.html https://slate.com/technology/2019/04/sat-prep-courses-do-the...