I only looked at the higher paper which is an acceptable (just about) in my opinion.
The issue is not to make an exam harder only.
If this is to happen the boundary for an A* will be around 60 and here we go again .... more political spin.
Topics need to come onto the curriculum early, instead of doing fractions, %, ratio for 5 years in a row...
I did fractions in Year 6 (educated abroad)
We never did fractions ever again. In year 9 we were completing the square.
I think maths should be core until Y9.
After year 9 there should be a compulsory GCSE paper in applicable, sensible everyday arithmetic, data and mensuration. (NO ALGEBRA!)
Those who wish to do maths, take it as an option in Year 10 and let me design the curriculum for that ...