My guess would be that the grade boundaries should be in line with the maths grade boundaries last year ( percentage wise), so around 75-80% should be a 9. Obviously, this isn’t a guarantee as boundaries are set once everything is marked, however it is a new spec and most of the country is doing pretty crap to be honest. Another thing is that the higher paper awards 7 Grades so content across 7 Grades must be spread across 100 Marks. This is why maths saw only around 20-25% to get a 4.