I researched about this for my first book, Free Will? As a teacher I am acutely aware of this, but it seems like nothing is ever done. However, the stats have consistently supported the fact that there is a problem with achievement and self-confidence. Let me explain.

In the Uk, for example, children start school at aged 5. The cut-off date is September 1st. This means that a child can be born on September 1st and be in the same school year as someone born on August 30th LATER that same year. In other words, one child can be 60 months old, and another effectively 48 months old when they start school.