Helped boost my score 30 points!

I first took the GMAT in 2015 after self-study only and received a 680. I was not satisfied with the score but wanted to wait until I was 100% sure I needed to attend business school before retaking. I decided to apply to b-school in 2017 and signed up to do a group prep-course from February-April 2017. The course was most helpful in that it gave me a syllabus and road-map for studying and kept me honest by assigning homework each week. The actual course was helpful for problem solving strategy but a majority of my learning came during homework time. I made it over the 700 hump and almost to my ultimate goal of 720. I ended up being accepted to all three business schools I applied to in Round 1 and don't think I could have without the course.