The new GCSEs (above) started in Autumn 2016. Prior to that WJEC provided similar exams but just at Higher and Foundation level. The first 3 or 4 questions in the papers below would now not appear in the Higher paper but in the Intermediate paper.
Methods in Maths
(similar to GCSE Maths)
Application of Mathematics
(similar to GCSE Maths - Numeracy)