ETON is leading hundreds of private schools in a proposed boycott of this year’s A-Level and GCSE league tables. Up to 30 per cent of the 649 schools that normally submit results may hold back grades because of fears about the accuracy of marking. More than two-thirds of members of the Headmasters’ and Headmistresses’ Conference, which represents independent schools, said that they were in favour of the abolition of the tables.