I’m thinking about enrolling in prepscholar myself. I think the number of hours depends on you. For example, I’m planning to do an hour of prep each day throughout the summer which will add up to 40+ hours. Hopefully, this should help me increase my score more than a 100 points if I put in that much work. However, if someone only does 5 hours of work in total, it probably wont help them as much. It all depends on the person. If your committed, anything is possible.