The person to whom I responded seemed to imply that it consists chiefly or entirely of taking practice exams. I merely wish to point out that if you want your kid to take SAT practice exams every month you can do it for free at home.
Such a "SAT test prep course" is going to involve more than just self-guided practice exams. It'll include feedback and coaching to address deficits revealed by those practice exams.
This is exactly right. Writing each practice exam only takes a few hours and this course last months. The reset of the time is filled with all the things you talked about.
Plus, for some kids writing a practice exam at home isn’t the same thing as a simulated seating with kids all around and a proctor in the room.
I actually took fairly involved test prep way back when (and didn't end up actually writing the SAT) and there really wasn't anything to it beyond the practice exams that I couldn't have figured out myself.