Education charity The Sutton Trust, which commissioned the survey, has said the results highlight the need to close the education gap between young people from different social backgrounds:
Private tuition is booming, particularly in London, despite the fact that many families have been forced to tighten their belts over recent years.
Parents naturally want to do the best for their children. Providing private tuition for them puts those children whose parents can't afford it at a disadvantage.
That's why it is so crucial that we find a successful way to ensure that the learning gap is narrowed for less advantaged children.