One major advantage over tutoring as opposed to a classroom environment is the personalised approach you can take to your teaching. You will either be working with students one to one or you will be working with a small group, so you will have the chance to really understand the group and get to know their needs. This gives you the freedom to work on their weaknesses, using the methods in which they learn best.
All people will learn differently and school-age pupils are no different. Some will remember things you say, whilst others will need to write facts down in order to remember them. You can incorporate methods of learning that your pupils engage with and enjoy, as this allows you to really make an impact on their learning. Just ensure that you are covering areas that are in the syllabus, so they come out of tutoring better equipped to deal with exams.