The number of children having private tutoring has increased by more than a third in the last decade, according to a charity.
The Sutton Trust said one in four children have had a private tutor to help them with exams or school work.
The charity is calling on the Government to look at means-tested state funding for private tuition to ensure poorer youngsters do not miss out.
A poll of almost 2,500 11 to 16-year-olds by the trust shows that 25% say they have received private tuition at some point, compared to 18% who said the same in 2005.