First, some get behind and don’t understand why. Most likely the subject wasn’t taught in the first place. They need personal attention from someone who knows the subject, knows children and knows how to excite that child to his full potential.
Second, some children have done everything required and they need to move on. Perhaps that child wants to be an engineer, or a scientist, or a doctor or a lawyer, and he wants to understand upper level math and really know it well.
But don’t forget that even those children do better when learning is fun. Real learning is fun. Creeping along is a drag! Call now.