YSGOL Bro Myrddin in Carmarthen is set to become the first official Welsh Medium secondary school in county.
Carmarthenshire County Council executive board discussed the issue at its meeting this week and endorsed the proposal to proceed with the statutory consultation process.
It means every subject apart from English, including science and maths, will be taught through the medium of Welsh.
An informal consultation with pupils, governors, staff, parents and prospective parents has been completed and has shown support for the move.
Traditionally, all lessons apart from maths and science are taught in Welsh, and figures now reveal that most pupils have already chosen to learn these subjects in Welsh also.
From years seven to 12/13 a total of 43 pupils learn maths through the medium of English, compared to 723 in Welsh.
In science, almost twice as many pupils are taught in Welsh than English, with 509 and 274 with numbers increasing year on year from 48/58 in years 12/13 to 107/30 in year seven.
Education executive board member Councillor Gareth Jones said: “The change is clearly visible and this is proof that the demand from parents and pupils for the provision of subjects in English has been reduced.
“This is a natural progression for the school with the change already happening.
“It is an opportunity to lead the way in the county and in West Wales, and for Bro Myrddin to create history by establishing the first Welsh secondary school in Carmarthenshire.”
Ysgol Gyfun Gymraeg Bro Myrddin is currently a category 2A bilingual school which means that at least 80 percent of the curriculum is taught through the medium of Welsh.
The intention is that the school will move towards the official Welsh Medium classification in September 2016 following the statutory consultation process.
A report with views and comments received will go before County Council for decision as to whether or not to proceed to the next stage and publish a statutory notice.
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