Prior to this course, my SAT score was 1180. I signed up hoping to see some improvement, but doubting the 200 point guarantee. By the last practice test, I had improved astonishingly: my score is now 1490! I honestly did not think that was possible. The homework assignments helped me to really familiarize myself with the types of problems I will encounter on the SAT, and I have increasingly become super comfortable with doing the math problems. I found that the strategies taught were very helpful and I've noticed myself using them almost subconciously during the practice tests. I also really appreciated my instructor's (Ilia Kolmagorov) effort to answer every question, no matter how small. Overall, Prep Expert was very worth the money and time! I would highly recommend.