Prep Expert, for me, was a great review course for the SAT. I received many helpful tips and strategies that have helped me improve mainly in the reading and writing sections of the SAT. My teacher Celina was amazing! She was very charismatic and explained every topic thoroughly. However, trying to sign on to the online class was sometimes difficult. Moreover, there were some delays in essay grading during my course. The main reason I gave Prep Expert four stars is because I did not see much improvement in my math scores despite the 200-point guarantee. Overall, Prep Expert is a great resource for those seeking SAT score improvements.