What is your favorite guaranteed sat prep?
Nothing is guaranteed.
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Basic law of statistics- the lower the original score, the greater the likelihood of improvement (i.e. it is easier to go from a 550 to a 600 than from a 750 to an 800). At the top-- 780 or so- you might only be able to get one question wrong!
So what guarantees are you looking for?
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Agree that no test prep can guarantee results in a meaningful way. IMO the more important things are to: 1) find a program/setting that will work best for your child and is in budget and 2) have the student consistently dedicate time/energy towards test prep. Even with test prep, some students may max out at certain scores - and that is fine.
In terms of test prep there are many options available in many different formats (ex. online class, in person group class, private tutor, Khan Academy, self-study). Again, consider what will work best for the student.
S25 did the Princeton Review 1400 this summer. He just took the test Saturday so no idea if it worked or not 
He had to have a 1250 (I think) on the first practice test in order to qualify for the money back guarantee and he had to do ALL of the homework and never miss a class. The homework was a lot. He wanted to take the class but I’m pretty sure he was just clicking C by the end of the homework assignments. 
My coworker paid $15K for a college counselor, $5K for SAT prep (guaranteed 1500?? Y2 academy https://www.y2academy.com/), $2K for an essay writer and now pays $80K per year but his kid goes to a T10 school as a premed. YMMV
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Reminder that CC is not a referral service. As such I’m closing the thread.