By choosing the reading test against which to benchmark they have selected the test which students generally perform better at. However it is less of an indicator to future performance than the more challenging SPAG papers. This would lead to students expected levels of progress being greater (which some would argue is a good thing that drives up standards). I worry that if it is not realistic then students suffer at the age of 16 when they are struggling to meet these expectations. Adjusting the difficulty of the reading paper would clearly have an impact at secondary. Whether you think that is a good thing depends on your perspective. I care about my teenagers greatly, many of them are staggered that we still have to sit down and discuss levels of progress from when they were in year 6! Most of them have forgotten the tests but the legacy it leaves in terms of targets lives on.