GCSE Maths

Does anyone know where to find really difficult gcse maths questions? Thanks!

On gcse maths tutor yt channel they go through the hardest types, I usually pause the video before attempting the question then unpause to see the solution.
Maths genie also has maths questions by topic and by grade (for example: completing the square topic is on the grade 9 section).
You could also search up grade 9 maths questions gcse.

Good luck!