Disappointing SAT results

We are in the same boat. This June test was a joke. My daughter is a fantastic student. She has been working with a private tutor for 4 months, worked her way through the entire college board blue review book, did all 8 practice tests and went up only 10 points. I am considering one of these online prep companies that guarantees score improvement. Does anyone have any experience with any of them and did they get the desired results. Obviously the private tutor we used was useless and expensive!