It is a safe bet to guarantee that this course will raise your score a significant amount. But as with everything, it goes down to how you treat it. Pay attention and ask questions in the lesson, utilize the supplemental material online, and take your time through the lesson books and you will definitely be in good standing to get a high score on the GMAT. The instructor was great, friendly, and helpful. I was very impressed with the quality that the lesson books had and with how thorough they were. The convenience of having it be an online class also is nice. There are no gimmicks to the online structure, it works well.