My instructors name was Illia Kolmagorov. My score improvement was about 50 points from when I started to the end. He was very helpful and gave very useful tips and approaches to help ensure success for the students. The prep export course itself had very good practices that were varying difficulty and helped me significantly. The answer explanations were also very helpful and they helped me keep track of what I was doing wrong and ways I could improve. Overall, prep expert is a wonderful resource for anyone who needs a detailed and organize study plan to help outline their plan to prepare for the SAT.