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