David Evans, Secretary of the National Union of Teachers (NUT) Cymru, said they back the comprehensive schools system fully.
He said "it suits us - its suits the people of Wales - it suits the children of Wales."
The last grammar school in Wales closed in 1988, but the Welsh Conservatives are calling for a return to the grammar system.
More top news
A car was left completely submerged by water after a driver was caught out by the tide when he drove onto the beach at Burry Port.
Feeling pleasant with sunny spells and a maximum temperature of 13 °C
Hundreds of people have gathered at Ffos-y-fran near Merthyr Tydfil to halt operations at the UK's largest opencast coal mine.