The Question Level Analysis for the ks2 tests now provided on ASP (the RAISE online replacement) contains national and school data which can be useful to key stage 2 teachers to inform their future teaching. It's also useful for year 7 teachers, but they don't often get access to this information.
So, for the benefit of many teachers and children, here's a breakdown of the parts of the 2017 maths tests that children scores the country struggled with the most: