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.
More top news
Holyhead is one of Britain's busiest ports, but after today's vote what does the future hold?
David Cameron has announced he is to resign as prime minister by October. We look at who could replace him.
Wales' manager says Wales "can't afford to look past the next game" as they prepare for their Euro 2016 showdown with Northern Ireland.