Ysgol Gyfun Dyffryn Teifi is a designated bilingual school for pupils aged between 11 and 18, which is maintained by Ceredigion local authority. It has 499 pupils, including 89 students in the sixth form. The school serves the town of Llandysul, in addition to a wide rural catchment area. Nine point seven per cent (9.7%) of pupils are entitled to free school meals, which is lower than the national percentage of 17.4%. All pupils belong to the white British ethnic group. The school admits pupils from the full ability range. Two point six per cent (2.6%) of pupils have a statement of special educational needs, which is similar to the national percentage. In addition, about 27% of pupils are on school action and school action plus measures, which is lower than the national percentage. Eighty one per cent (81%) of pupils come from homes in which Welsh is spoken. Nearly all aspects of the curriculum are delivered through the medium of Welsh. The headteacher was appointed to his post in 2006. The deputy headteacher and one assistant headteacher were also in post at the time of the last inspection. An additional assistant headteacher was appointed during the last year. The individual school budget per pupil for Ysgol Gyfun Dyffryn Teifi in 2012-2013 is £5,182. The maximum per pupil in secondary schools in Ceredigion is £6,490 and the minimum is £4,468. Ysgol Gyfun Dyffryn Teifi is in fourth place out of the seven secondary schools in Ceredigion in terms of school budget per pupil.