Earlier quoted context omitted.
It’s still paying in time for a poor person. The wealthy hire an SAT tutor for a hundred+ an hour to bump their kid’s scores up by a third for maybe 20 hours of work. The poor student will spend much more time. It’s like many things where the poor pay in time rather than money.
My kids wrote SAT. The only resource used was Khan Academy and previous test papers made available by college board. You really don’t need any more resources for SAT.
Being on this site, you're probably someone who values education. And you probably raised your kids to be capable. Or maybe they just lucked out and got the correct weights to succeed in that particular scenario, but you can't assume that the situation for everyone is the same as you!
Many people simply can't learn by just doing practice tests and watching videos. If it were so easy, then we wouldn't need teachers or schools in general. Mentorship and guidance are important, and it's the reason why so many people want to get into universities in the first place.
Essentially, yes you can do without, but having it helps. Overall, that would create a disparity that favors more wealthy people.