The title ‘County School’ already existed and was used by the school prior to the Education Act 1944. However, the Act insisted on the term being used for all LEA maintained primary and secondary schools.

In 1947 the school was inspected and the HMI report was not favorable. The report stated that ‘there is nothing in this school on which the eye can alight with pleasure’, The school site had been significantly affected by a fire in 1939, but despite the fact that the science laboratories and the domestic science room had been destroyed, the plans to re-build the school (submitted in 1939) had been deferred as a consequence of the war and the lack of money, labour, and materials.

Ysgol Gyfun Llangefni was built due to Anglesey’s prominent role as a pioneer of comprehensive schooling. Construction began in 1950 and was completed by 1953. The school first opened its doors in 1953 to all the children of secondary school age in the catchment area with a then capacity of 842.

School Ethos

"Gorau Cynnydd Cadw Moes" translates to 'Courtesy paves the way to success'. Inclusion, a Welsh ethos , diversity, equality, respect and empathy are the values upheld at the school.

School site

The school is located on a single campus.

There is a leisure centre neighbouring the school to the left called Plas Arthur and to the right of the school is Canolfan Addysg y Bont, a school for young people with special educational needs. The school shares some facilities with both establishments.

Facilities

• A School hall with sound and vision equipment.
• An outdoor steel dining canopy. A covered space outside where students can sit to eat during their lunch period.
• A school canteen with indoor dining facilities.
• A covered Multi-Use Games Area. Used for a variety of different sporting activities.
• A large floodlit 3G artificial turf sports pitch. (Shared with Plas Arthur leisure centre)
• 2 traditional school gyms with climbing equipment, ropes, gymnastic apparatus and crash mats.
• Playing fields used for rugby, football, and athletics.
• Fenced outdoor tennis courts.
• 7 full ICT suites used by various departments.
• 2 Design & Technology multi use workshops.
• 1 Food Technology home economics suite facilitating catering and textile technology lessons.
• 1 Music room.
• 8 Science labs.
• A video conferencing room used for meetings and for pupils to follow curriculum courses offered off site.
• The Noddfa support centre. A unit set up for pupils with emotional needs to receive purposeful interventions and support.
• A sixth form common room.

Curriculum

Pupils currently follow the Curriculum for Wales (2022–present) from year 7 through 8.

The school offers a variety of subjects at GCSE and at AS/A2 levels, the Welsh Baccalaureate, and some vocational courses. The school also offers additional subjects taught at other sites through the local educational consortium.

School houses

The school's four houses annually compete in the school sports day and school Eisteddfod. Each student and member of staff is placed in a school house.