We recommend 20 hours of tutoring. From the research that we have undertaken, we have found that with 20 hours of 1-1 tutoring students improved their grade outcome by x2.5!
Each student is unique, working towards their own goals at their own pace. How many lessons you require will depend on what you hope to achieve academically, how far you are from reaching your target grades, and how hard you work with your tutor.
Students usually have one or two lessons a week to keep on top of their studies.