How to go from a 550 to 650 on SAT Math?

My daughter made a 550 in Math (650 CR) on her first try at the SAT and would like to raise her math score by 100 points. I just bought the Pwn the SAT Math book but now I am wondering if that book is more for students scoring in the 600’s and trying to get to 700-800. Will this book help her or is there one that would be better for someone with a starting score in the 500’s?

Let her do a lot of sections and what she gets wrong, let her browse up the question online and find the answer for it. This allows her to know how this type of question could be solved and then solve similar question easily in future sections. Repeat until she knows most to all of the concepts