Yes, I think going over it with an adult helps. But the child has to be willing, otherwise it will turn into a tug of war, rather than a study session.
My daughter was not willing to let me help her study, just as she almost always refuses my offer of help with studying for school tests or proof reading class papers. However, she didn't mind the help from the tutor, and found it very helpful to have an adult to help review specific concepts or remind her what a particular type of question required.