The Welsh Conservatives say a return to grammar school-style education in Wales is needed to boost standards.
Under their proposals, children would be assessed at the age of 14 and encouraged to follow either academic or vocational studies.
The idea has been criticised by opponents for turning the clock back to a divisive and discredited system.
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The latest poll focussed attention on how people intend to vote for Westminster but it also asked about next year's Assembly election.
A woman whose father is accused of murdering her baby has told a jury she never hurt the child