The art of tutoring involves just 2 things: how fast you can identify a problem and how well you can figure out how to teach a problem.
The largest problem a student will face, is lack of motivation. Students run out of motivation for many reasons: lack of rewards, tasks are too challenging, the pace of the classroom is too fast, or plain failure to achieve.
As a tutor, my number one goal is diagnostics: not only diagnostic that effect learning goals, but also to find out what is zapping your child's natural curiosity and want for success.
Tutoring without redressing a motivation or confidence problem is throwing coal onto a dying fire.... you have to fan the flames!