My daughter took SAT without any studying and, after she got her scores, she wanted to raise her reading/writing score. So, I paid for the expensive The Princeton Review online prep course. She attended every session, did her homework, and followed their strategies. Her score went down. We couldn’t believe it, so she study the same materials again on her own, and took the SAT again. Once again, her reading/writing score went down even lower.
Avoid The Princeton Review SAT prep course. It is not worth the money.
The higher your initial score is, the harder it is to raise it and many times a 2nd test will result in a decrease if the first score was very high. So someone who has a 750 on a section may have a greater chance of decreasing the score versus increasing versus someone who had a 550.
And a certain score indicates a range. For instance if you score a 650 - that indicates a range of 620-680, so any subsequent score in that range would be considered consistent.
In your D’s case, you might want to see if her test date allows her to get a copy of the test and her answers; then she can see what errors she made and if indeed it was something that the review class did not prepare her well for.