The Government's 14-19 reforms will overload school staff and could create a divisive two-tier system, the NASUWT and NUT said.
NUT delegates voted to scrap the introduction of new vocational diplomas to allow for an independent review of vocational education. But the NASUWT's president, John Mayes, said there was "much merit" in the reforms.
The NUT also warned that Gordon Brown's plan to increase the compulsory education and training age to 18 could mean young people being exploited and used as "even cheaper labour".
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